I am using the Chirpy theme for my GitHub Pages blog.
Follow the instructions in the Jekyll Docs to complete the installation of the basic environment. Git also needs to be installed.
Sign in to GitHub and use this template to generate a brand new repository and name it USERNAME.github.io, where USERNAME represents your GitHub username.
Then clone it to your local machine and run:
$ bundle
Please see the theme's docs.
This work is published under MIT License.