Program Security - Updated security introduction lesson (#395)

* Updated security intro lesson

* Updated security lesson

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Update content/courses/program-security/security-intro.md

Co-authored-by: Mike MacCana <[email protected]>

* Change branch name

* Merged changes

* Fixed links and content

* Added callout

* Added callout

* Added grammar fix

* Added grammar fix

---------

Co-authored-by: Mike MacCana <[email protected]>

content/courses/program-security/security-intro.md

@@ -1,48 +1,46 @@
 ---
-title: How to approach the Program Security module
+title: How to Approach the Program Security Course
 objectives:
-  - understand how to approach the Program Security Module
+  - Understand how to approach the Program Security Course
 description:
   "Learn how to think intelligently about security for your onchain programs,
-  whether developing in Anchor or in Native Rust."
+  whether developing in Anchor or Native Rust."
 ---
 
 ## Overview
 
-The goal of this course is to expose you to a wide variety of common security
-exploits that are unique to Solana development. We’ve heavily modeled this
-course off Coral's
-[Sealevel Attacks](https://github.com/coral-xyz/sealevel-attacks) repo.
+This course aims to introduce you to a range of common security exploits unique
+to Solana development. We’ve modeled this course heavily on Coral's
+[Sealevel Attacks](https://github.com/coral-xyz/sealevel-attacks) repository.
 
-We've covered program security in our
+Program security is covered in our
 [Anchor](/content/courses/onchain-development.md) and
-[native Rust](/content/courses/native-onchain-development.md) development
-courses because we wanted to make sure that anyone deploying programs to Mainnet
-right out of the gates had at least a basic understanding of security. And if
-that’s you then hopefully the fundamental principles you learned in that lesson
-have led to you avoiding some common Solana exploits on your own.
-
-This unit is meant to build on top of that lesson with two goals in mind:
-
-1. To expand your awareness of the Solana programming model and the areas where
-   you need to focus to close up security loopholes in your programs
-2. To show you the array of tools provided by Anchor to help you keep your
-   programs secure
-
-If you went through the Basic Security lesson, the first few lessons should seem
-familiar. They largely cover topics we discussed in that lesson. After that,
-some of the attacks may seem new. We encourage you to go through all of them.
-
-The last thing to call out is that there are a lot more lessons in this course
-than in prior course. And the lessons aren't dependent on each other in the same
-ways, so you can bounce around a bit more if you'd like.
-
-Originally, we were going to have more, shorter lessons in this course. And
-while they might be shorter than average, they aren't much shorter. It turns out
-that even though each of the security vulnerabilities is "simple," there's a lot
-to discuss. So each lesson may have a little bit less prose and more code
-snippets, making it easy for readers to choose how in depth to go. But,
-ultimately, each lesson is still as fully-fledged as they have been before so
-that you can really get a solid grasp on each of the discussed security risks.
-
-As always, we appreciate feedback. Good luck digging in!
+[Native Rust](/content/courses/native-onchain-development.md) development
+courses to ensure that anyone deploying programs to Mainnet has at least a basic
+understanding of security. Those courses should help you avoid some common
+Solana exploits on your own.
+
+This course builds on those courses with two main goals:
+
+1. Expand your awareness of the Solana programming model and highlight areas
+   where you need to focus to close security loopholes.
+2. Introduce you to the tools provided by Anchor to help keep your programs
+   secure, and show native Rust users how to implement similar techniques on
+   their own.
+
+While the first few lessons in this course cover topics similar to those in the
+[Anchor course](/content/courses/onchain-development/intro-to-anchor.md) or
+[Program Security lesson](/content/courses/native-onchain-development/program-security.md)
+in the [Native Course](/content/courses/native-onchain-development.md), but as
+you progress, you’ll encounter new types of attacks. We encourage you to explore
+all of them.
+
+<Callout>
+Unlike the lessons in other courses, which are in order, you are welcome to
+explore these lessons in whatever order suits you best. </Callout>
+
+Even though each security vulnerability may seem "simple," there's a lot to
+discuss. These lessons contain less prose and more code, ensuring you gain a
+solid understanding of the security risks discussed.
+
+As always, your feedback is appreciated. Good luck as you delve into the course!