diff --git a/cypress/integration/page.spec.js b/cypress/integration/page.spec.js
index d85f6bb7d..9e321b5c4 100644
--- a/cypress/integration/page.spec.js
+++ b/cypress/integration/page.spec.js
@@ -171,7 +171,7 @@ Cypress.on('fail', (e) => {
 
 describe('', () => {
   beforeEach(() => {
-    if (failed) Cypress.runner.stop();
+    // if (failed) Cypress.runner.stop();
   });
 
   describe('Page by default', () => {
diff --git a/src/App.tsx b/src/App.tsx
index db56b44b0..080d3f0df 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,15 +1,101 @@
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import 'bulma/bulma.sass';
 import '@fortawesome/fontawesome-free/css/all.css';
 import './App.scss';
+import cn from 'classnames';
 
-import classNames from 'classnames';
 import { PostsList } from './components/PostsList';
 import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
 import { Loader } from './components/Loader';
+import * as fetchUsers from './api/users';
+import * as fetchPosts from './api/posts';
+import * as fetchComments from './api/comments';
+import { User } from './types/User';
+import { Post } from './types/Post';
+import { Comment } from './types/Comment';
+import { client } from './utils/fetchClient';
 
 export const App: React.FC = () => {
+  const [users, setUsers] = useState<User[]>([]);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [selectedUser, setSelectedUser] = useState<User | null>(null);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
+  const [isLoadingPosts, setIsLoadingPosts] = useState(false);
+  const [isLoadingComments, setIsLoadingComments] = useState(false);
+  const [isShowingComments, setIsShowingComments] = useState(false);
+  const [isShowingForm, setIsShowingForm] = useState(false);
+  const [errorPosts, setErrorPosts] = useState(false);
+  const [errorComments, setErrorComments] = useState(false);
+
+  useEffect(() => {
+    fetchUsers.getUsers('/users')
+      .then(res => setUsers(res));
+  }, []);
+
+  useEffect(() => {
+    if (selectedUser) {
+      setIsLoadingPosts(true);
+      setErrorPosts(false);
+
+      fetchPosts.getPosts(`/posts?userId=${selectedUser.id}`)
+        .then(res => setPosts(res))
+        .catch(() => setErrorPosts(true))
+        .finally(() => setIsLoadingPosts(false));
+    }
+  }, [selectedUser]);
+
+  const showPostDetails = (post: Post) => {
+    setIsLoadingComments(true);
+    if (post.id === selectedPost?.id) {
+      setIsShowingComments(!isShowingComments);
+      setSelectedPost(null);
+    }
+
+    if (!selectedPost?.id || selectedPost?.id !== post.id) {
+      setIsShowingComments(true);
+      setSelectedPost(post);
+      setErrorComments(false);
+
+      fetchComments.getComments(`/comments?postId=${post.id}`)
+        .then(res => {
+          setComments(res);
+          setIsLoadingComments(false);
+        })
+        .catch(() => setErrorComments(true));
+    }
+
+    setIsShowingForm(false);
+  };
+
+  const updateSelectedUser = (user: User | null) => {
+    setSelectedUser(user);
+    setIsShowingComments(false);
+    setSelectedPost(null);
+  };
+
+  const handleDeleteComment = (commentId: number) => {
+    const showingComments = comments
+      .filter(comment => comment.id !== commentId);
+
+    setComments(showingComments);
+
+    client.delete(`/comments/${commentId}`);
+  };
+
+  const createNewComment = (newComment: Comment) => {
+    setComments([...comments, newComment]);
+  };
+
+  const handleChangeErrorState = (el: boolean) => {
+    setErrorComments(el);
+  };
+
+  const isShowingLoader = !errorPosts && isLoadingPosts;
+  const isShowingNoUserSelect = !errorPosts && !selectedUser && !isLoadingPosts;
+  const isShowingPosts = !isLoadingPosts && selectedUser && !errorPosts;
+
   return (
     <main className="section">
       <div className="container">
@@ -17,45 +103,80 @@ export const App: React.FC = () => {
           <div className="tile is-parent">
             <div className="tile is-child box is-success">
               <div className="block">
-                <UserSelector />
+                <UserSelector
+                  users={users}
+                  selectedUser={selectedUser}
+                  updateSelectedUser={updateSelectedUser}
+                />
               </div>
 
               <div className="block" data-cy="MainContent">
-                <p data-cy="NoSelectedUser">
-                  No user selected
-                </p>
+                {isShowingLoader
+                  && <Loader />}
 
-                <Loader />
+                {isShowingNoUserSelect && (
+                  <p data-cy="NoSelectedUser">
+                    No user selected
+                  </p>
+                )}
 
-                <div
-                  className="notification is-danger"
-                  data-cy="PostsLoadingError"
-                >
-                  Something went wrong!
-                </div>
+                {isShowingPosts && posts.length > 0
+                  && (
+                    <PostsList
+                      posts={posts}
+                      showPostDetails={showPostDetails}
+                      openPostId={selectedPost?.id}
+                    />
+                  )}
 
-                <div className="notification is-warning" data-cy="NoPostsYet">
-                  No posts yet
-                </div>
+                {isShowingPosts && !posts.length
+                  && (
+                    <div
+                      className="notification is-warning"
+                      data-cy="NoPostsYet"
+                    >
+                      No posts yet
+                    </div>
+                  )}
 
-                <PostsList />
+                {errorPosts && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
               </div>
             </div>
           </div>
 
           <div
             data-cy="Sidebar"
-            className={classNames(
+            className={cn(
               'tile',
               'is-parent',
               'is-8-desktop',
               'Sidebar',
-              'Sidebar--open',
+              { 'Sidebar--open': isShowingComments },
             )}
           >
-            <div className="tile is-child box is-success ">
-              <PostDetails />
-            </div>
+            {selectedPost && (
+              <div className="tile is-child box is-success">
+                <PostDetails
+                  comments={comments}
+                  selectedPost={selectedPost}
+                  isLoadingComments={isLoadingComments}
+                  openPostId={selectedPost?.id}
+                  addComment={createNewComment}
+                  isShowingForm={isShowingForm}
+                  changeIsShowingForm={setIsShowingForm}
+                  onDelete={handleDeleteComment}
+                  error={errorComments}
+                  changeErrorState={handleChangeErrorState}
+                />
+              </div>
+            )}
           </div>
         </div>
       </div>
diff --git a/src/api/comments.ts b/src/api/comments.ts
new file mode 100644
index 000000000..7c4691ab4
--- /dev/null
+++ b/src/api/comments.ts
@@ -0,0 +1,14 @@
+import { Comment } from '../types/Comment';
+import { client } from '../utils/fetchClient';
+
+export const getComments = (url: string) => {
+  return client.get<Comment[]>(url);
+};
+
+export const addComment = (url: string, newComment: Comment) => {
+  return client.post<Comment>(url, newComment);
+};
+
+export const deleteComment = (url: string) => {
+  return client.delete(url);
+};
diff --git a/src/api/posts.ts b/src/api/posts.ts
new file mode 100644
index 000000000..9f911316f
--- /dev/null
+++ b/src/api/posts.ts
@@ -0,0 +1,6 @@
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getPosts = (url: string) => {
+  return client.get<Post[]>(url);
+};
diff --git a/src/api/users.ts b/src/api/users.ts
new file mode 100644
index 000000000..8210b7fa5
--- /dev/null
+++ b/src/api/users.ts
@@ -0,0 +1,6 @@
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getUsers = (url: string) => {
+  return client.get<User[]>(url);
+};
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
index 73a8a0b45..b58d50492 100644
--- a/src/components/NewCommentForm.tsx
+++ b/src/components/NewCommentForm.tsx
@@ -1,8 +1,62 @@
-import React from 'react';
+import React, { useState } from 'react';
+import cn from 'classnames';
+
+import { Comment } from '../types/Comment';
+import { addComment } from '../api/comments';
+
+interface Props {
+  postId: number,
+  addNewComment: (el: Comment) => void,
+  changeErrorState: (el: boolean) => void,
+}
+
+export const NewCommentForm: React.FC<Props> = ({
+  postId,
+  addNewComment,
+  changeErrorState,
+}) => {
+  const [inputName, setInputName] = useState('');
+  const [inputMail, setInputMail] = useState('');
+  const [textarea, setTextarea] = useState('');
+  const [submitAttempted, setSubmitAttempted] = useState(false);
+  const [isAdding, setIsAdding] = useState(false);
+
+  const handleReset = () => {
+    setInputName('');
+    setInputMail('');
+    setTextarea('');
+    setSubmitAttempted(false);
+  };
+
+  const handleSumbit = (event: React.FormEvent) => {
+    event.preventDefault();
+    changeErrorState(false);
+    const newComment = {
+      id: 0,
+      postId,
+      name: inputName,
+      email: inputMail,
+      body: textarea,
+    };
+
+    if (inputName.trim() && inputMail.trim() && textarea.trim()) {
+      setIsAdding(true);
+      addComment('/comments', newComment)
+        .then(() => {
+          setTextarea('');
+          addNewComment(newComment);
+          setIsAdding(false);
+        })
+        .catch(() => changeErrorState(true));
+    }
+
+    if (!inputName.trim() || !inputMail.trim() || !textarea.trim()) {
+      setSubmitAttempted(true);
+    }
+  };
 
-export const NewCommentForm: React.FC = () => {
   return (
-    <form data-cy="NewCommentForm">
+    <form data-cy="NewCommentForm" onSubmit={handleSumbit}>
       <div className="field" data-cy="NameField">
         <label className="label" htmlFor="comment-author-name">
           Author Name
@@ -14,24 +68,33 @@ export const NewCommentForm: React.FC = () => {
             name="name"
             id="comment-author-name"
             placeholder="Name Surname"
-            className="input is-danger"
+            className={cn(
+              'input',
+              { 'is-danger': !inputName && submitAttempted },
+            )}
+            value={inputName}
+            onChange={e => setInputName(e.target.value)}
           />
 
           <span className="icon is-small is-left">
             <i className="fas fa-user" />
           </span>
 
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+          {!inputName && submitAttempted && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Name is required
-        </p>
+        {!inputName && submitAttempted && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Name is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="EmailField">
@@ -41,28 +104,37 @@ export const NewCommentForm: React.FC = () => {
 
         <div className="control has-icons-left has-icons-right">
           <input
-            type="text"
+            type="email"
             name="email"
             id="comment-author-email"
             placeholder="email@test.com"
-            className="input is-danger"
+            className={cn(
+              'input',
+              { 'is-danger': !inputMail && submitAttempted },
+            )}
+            value={inputMail}
+            onChange={e => setInputMail(e.target.value)}
           />
 
           <span className="icon is-small is-left">
             <i className="fas fa-envelope" />
           </span>
 
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+          {!inputMail && submitAttempted && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Email is required
-        </p>
+        {!inputMail && submitAttempted && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Email is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="BodyField">
@@ -75,25 +147,39 @@ export const NewCommentForm: React.FC = () => {
             id="comment-body"
             name="body"
             placeholder="Type comment here"
-            className="textarea is-danger"
+            className={cn(
+              'textarea',
+              { 'is-danger': !textarea && submitAttempted },
+            )}
+            value={textarea}
+            onChange={e => setTextarea(e.target.value)}
           />
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
+        {!textarea && submitAttempted && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Enter some text
+          </p>
+        )}
       </div>
 
       <div className="field is-grouped">
         <div className="control">
-          <button type="submit" className="button is-link is-loading">
+          <button
+            type="submit"
+            className={cn('button', 'is-link', { 'is-loading': isAdding })}
+          >
             Add
           </button>
         </div>
 
         <div className="control">
           {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
+          <button
+            type="reset"
+            className="button is-link is-light"
+            onClick={handleReset}
+          >
             Clear
           </button>
         </div>
diff --git a/src/components/Post.tsx b/src/components/Post.tsx
new file mode 100644
index 000000000..69352a1fb
--- /dev/null
+++ b/src/components/Post.tsx
@@ -0,0 +1,48 @@
+import React from 'react';
+import cn from 'classnames';
+import { Post } from '../types/Post';
+
+interface Props {
+  id: number,
+  title: string,
+  userId: number,
+  body: string,
+  openPostId?: number,
+  onClick: (el: Post) => void,
+}
+
+export const PostItem: React.FC<Props> = ({
+  id,
+  title,
+  userId,
+  body,
+  openPostId,
+  onClick,
+}) => (
+  <tr
+    data-cy="Post"
+  >
+    <td data-cy="PostId">{id}</td>
+
+    <td data-cy="PostTitle">
+      {title}
+    </td>
+
+    <td className="has-text-right is-vcentered">
+      <button
+        type="button"
+        data-cy="PostButton"
+        className={cn(
+          'button',
+          'is-link',
+          { 'is-light': openPostId !== id },
+        )}
+        onClick={() => onClick(({
+          id, userId, title, body,
+        }))}
+      >
+        {openPostId === id ? 'Close' : 'Open'}
+      </button>
+    </td>
+  </tr>
+);
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
index ace945f0a..f74b277ec 100644
--- a/src/components/PostDetails.tsx
+++ b/src/components/PostDetails.tsx
@@ -1,117 +1,122 @@
 import React from 'react';
 import { Loader } from './Loader';
 import { NewCommentForm } from './NewCommentForm';
+import { Comment } from '../types/Comment';
+import { Post } from '../types/Post';
+
+interface Props {
+  comments: Comment[],
+  selectedPost: Post,
+  isLoadingComments: boolean,
+  openPostId: number,
+  addComment: (el: Comment) => void,
+  isShowingForm: boolean,
+  changeIsShowingForm: (el: boolean) => void,
+  onDelete: (id: number) => void,
+  error: boolean,
+  changeErrorState: (el: boolean) => void
+}
+
+export const PostDetails: React.FC<Props> = ({
+  comments,
+  selectedPost,
+  isLoadingComments,
+  openPostId,
+  addComment,
+  isShowingForm,
+  changeIsShowingForm,
+  onDelete,
+  error,
+  changeErrorState,
+}) => {
+  const isIdle = !error && !isLoadingComments;
+  const hasComments = isIdle && Boolean(comments.length) && comments;
+  const hasNoComments = isIdle && !comments.length && comments;
 
-export const PostDetails: React.FC = () => {
   return (
     <div className="content" data-cy="PostDetails">
       <div className="content" data-cy="PostDetails">
+
         <div className="block">
           <h2 data-cy="PostTitle">
-            #18: voluptate et itaque vero tempora molestiae
+            {`#${selectedPost.id}: ${selectedPost.title}`}
           </h2>
 
           <p data-cy="PostBody">
-            eveniet quo quis
-            laborum totam consequatur non dolor
-            ut et est repudiandae
-            est voluptatem vel debitis et magnam
+            {selectedPost.body}
           </p>
         </div>
 
         <div className="block">
-          <Loader />
-
-          <div className="notification is-danger" data-cy="CommentsError">
-            Something went wrong
-          </div>
-
-          <p className="title is-4" data-cy="NoCommentsMessage">
-            No comments yet
-          </p>
-
-          <p className="title is-4">Comments:</p>
+          {!error && isLoadingComments && (
+            <Loader />)}
 
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
+          {error && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
             </div>
+          )}
 
-            <div className="message-body" data-cy="CommentBody">
-              Some comment
-            </div>
-          </article>
+          {hasNoComments && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
 
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a
-                href="mailto:misha@mate.academy"
-                data-cy="CommentAuthor"
-              >
-                Misha Hrynko
-              </a>
+          {hasComments && (
+            <p className="title is-4">Comments:</p>
+          )}
 
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
+          {hasComments
+            && comments.map(({
+              id, email, name, body,
+            }) => (
+              <article
+                className="message is-small"
+                data-cy="Comment"
+                key={id}
               >
-                delete button
-              </button>
-            </div>
-            <div
-              className="message-body"
-              data-cy="CommentBody"
-            >
-              One more comment
-            </div>
-          </article>
+                <div className="message-header">
+                  <a href={`mailto:${email}`} data-cy="CommentAuthor">
+                    {name}
+                  </a>
+                  <button
+                    data-cy="CommentDelete"
+                    type="button"
+                    className="delete is-small"
+                    aria-label="delete"
+                    onClick={() => onDelete(id)}
+                  >
+                    delete button
+                  </button>
+                </div>
 
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a
-                href="mailto:misha@mate.academy"
-                data-cy="CommentAuthor"
-              >
-                Misha Hrynko
-              </a>
+                <div className="message-body" data-cy="CommentBody">
+                  {body}
+                </div>
+              </article>
+            ))}
 
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
-
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
+          {isIdle
+            && (isShowingForm
+              ? (
+                <NewCommentForm
+                  postId={openPostId}
+                  addNewComment={addComment}
+                  changeErrorState={changeErrorState}
+                />
+              )
+              : (
+                <button
+                  data-cy="WriteCommentButton"
+                  type="button"
+                  className="button is-link"
+                  onClick={() => changeIsShowingForm(true)}
+                >
+                  Write a comment
+                </button>
+              ))}
         </div>
-
-        <NewCommentForm />
       </div>
     </div>
   );
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
index cf90f04b0..391060808 100644
--- a/src/components/PostsList.tsx
+++ b/src/components/PostsList.tsx
@@ -1,86 +1,49 @@
 import React from 'react';
 
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
-
-    <table className="table is-fullwidth is-striped is-hoverable is-narrow">
-      <thead>
-        <tr className="has-background-link-light">
-          <th>#</th>
-          <th>Title</th>
-          {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
-          <th> </th>
-        </tr>
-      </thead>
-
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
-
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
-
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">19</td>
-          <td data-cy="PostTitle">adipisci placeat illum aut reiciendis qui</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">20</td>
-          <td data-cy="PostTitle">doloribus ad provident suscipit at</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-      </tbody>
-    </table>
-  </div>
-);
+import { Post } from '../types/Post';
+import { PostItem } from './Post';
+
+interface Props {
+  posts: Post[],
+  showPostDetails: (post: Post) => void,
+  openPostId?: number,
+}
+
+export const PostsList: React.FC<Props> = ({
+  posts,
+  showPostDetails,
+  openPostId,
+}) => {
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
+
+      <table className="table is-fullwidth is-striped is-hoverable is-narrow">
+        <thead>
+          <tr className="has-background-link-light">
+            <th>#</th>
+            <th>Title</th>
+            {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
+            <th> </th>
+          </tr>
+        </thead>
+
+        <tbody>
+          {posts.map(({
+            id, userId, title, body,
+          }) => (
+            <PostItem
+              id={id}
+              title={title}
+              userId={userId}
+              body={body}
+              openPostId={openPostId}
+              onClick={showPostDetails}
+              key={id}
+            />
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/User.tsx b/src/components/User.tsx
new file mode 100644
index 000000000..d6feb79bd
--- /dev/null
+++ b/src/components/User.tsx
@@ -0,0 +1,33 @@
+import React from 'react';
+import cn from 'classnames';
+
+import { User } from '../types/User';
+
+interface Props {
+  id: number,
+  name: string,
+  email: string,
+  phone: string,
+  selectedUserId?: number,
+  onClick: (el: User) => void,
+}
+
+export const UserLink: React.FC<Props> = ({
+  id,
+  name,
+  email,
+  phone,
+  selectedUserId,
+  onClick,
+}) => (
+  <a
+    href={`#user-${id}`}
+    className={cn('dropdown-item',
+      { 'is-active': id === selectedUserId })}
+    onClick={() => onClick({
+      id, name, email, phone,
+    })}
+  >
+    {name}
+  </a>
+);
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
index cb83a8f68..88f065361 100644
--- a/src/components/UserSelector.tsx
+++ b/src/components/UserSelector.tsx
@@ -1,10 +1,50 @@
-import React from 'react';
+import React, { useEffect, useRef, useState } from 'react';
+import cn from 'classnames';
+
+import { User } from '../types/User';
+import { UserLink } from './User';
+
+interface Props {
+  users: User[],
+  selectedUser: User | null,
+  updateSelectedUser: (el: User | null) => void,
+}
+
+export const UserSelector: React.FC<Props> = ({
+  users,
+  selectedUser,
+  updateSelectedUser,
+}) => {
+  const [isMenuOpen, setIsMenuOpen] = useState(false);
+
+  const dropdownMenuRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handleOutsideClick = (event: MouseEvent) => {
+      const target = event.target as HTMLElement;
+
+      if (!dropdownMenuRef.current?.contains(target)) {
+        setIsMenuOpen(false);
+      }
+    };
+
+    document.addEventListener('click', handleOutsideClick);
+
+    return () => {
+      document.removeEventListener('click', handleOutsideClick);
+    };
+  }, []);
+
+  const updateUserAndPosts = (currUser: User) => {
+    updateSelectedUser(currUser);
+    setIsMenuOpen(false);
+  };
 
-export const UserSelector: React.FC = () => {
   return (
     <div
       data-cy="UserSelector"
-      className="dropdown is-active"
+      className={cn('dropdown', { 'is-active': isMenuOpen })}
+      ref={dropdownMenuRef}
     >
       <div className="dropdown-trigger">
         <button
@@ -12,8 +52,13 @@ export const UserSelector: React.FC = () => {
           className="button"
           aria-haspopup="true"
           aria-controls="dropdown-menu"
+          onClick={() => setIsMenuOpen(!isMenuOpen)}
         >
-          <span>Choose a user</span>
+          <span>
+            {!selectedUser
+              ? 'Choose a user'
+              : selectedUser.name}
+          </span>
 
           <span className="icon is-small">
             <i className="fas fa-angle-down" aria-hidden="true" />
@@ -21,13 +66,26 @@ export const UserSelector: React.FC = () => {
         </button>
       </div>
 
-      <div className="dropdown-menu" id="dropdown-menu" role="menu">
+      <div
+        className="dropdown-menu"
+        id="dropdown-menu"
+        role="menu"
+      >
         <div className="dropdown-content">
-          <a href="#user-1" className="dropdown-item">Leanne Graham</a>
-          <a href="#user-2" className="dropdown-item is-active">Ervin Howell</a>
-          <a href="#user-3" className="dropdown-item">Clementine Bauch</a>
-          <a href="#user-4" className="dropdown-item">Patricia Lebsack</a>
-          <a href="#user-5" className="dropdown-item">Chelsey Dietrich</a>
+          {users.map(({
+            id, name, email, phone,
+          }) => (
+            <UserLink
+              id={id}
+              name={name}
+              email={email}
+              phone={phone}
+              selectedUserId={selectedUser?.id}
+              onClick={() => updateUserAndPosts({
+                id, name, email, phone,
+              })}
+            />
+          ))}
         </div>
       </div>
     </div>
diff --git a/src/index.tsx b/src/index.tsx
index 52a3c3016..c43c37c22 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,5 +1,7 @@
 import { createRoot } from 'react-dom/client';
 import { App } from './App';
 
-createRoot(document.getElementById('root') as HTMLElement)
+const root = document.getElementById('root') as HTMLElement;
+
+createRoot(root)
   .render(<App />);