More docs

Author: orta

README.md

@@ -12,11 +12,35 @@ If you are completely new to the TypeScript codebase, this YouTube video covers
 
 From there, you can start in the [First Steps to Contributing to the TypeScript Repo](./first_steps.md) consult the [Glossary](./GLOSSARY.md) or dive directly into the [`./codebase/`](./codebase) or [`./systems/`](./systems) folders.
 
-## Compilers in General
+## Related TypeScript Info
 
 - Learn how TypeScript works by reading the [mini-TypeScript implementation](https://github.com/sandersn/mini-typescript#mini-typescript)
+
+## Compilers in General
+
 - Recommended link for learning how compilers work: https://c9x.me/compile/bib/
 
+## Interesting PRs
+
+If you learn better by seeing how big features are added to TypeScript, here are a few big well-scoped Pull Requests:
+
+- Unions - [microsoft/TypeScript#824](https://github.com/microsoft/TypeScript/pull/824)
+- Type Aliases - [microsoft/TypeScript#957](https://github.com/microsoft/TypeScript/pull/957)
+- Async Functions - [microsoft/TypeScript#3078](https://github.com/microsoft/TypeScript/pull/3078)
+- TSX - [microsoft/TypeScript#3564](https://github.com/microsoft/TypeScript/pull/3564)
+- Intersection Types - [microsoft/TypeScript#3622](https://github.com/microsoft/TypeScript/pull/3622)
+- String Literal Types - [microsoft/TypeScript#5185](https://github.com/microsoft/TypeScript/pull/5185)
+- JS in TS - [microsoft/TypeScript#5266](https://github.com/microsoft/TypeScript/pull/5266)
+- Using JSDoc to extract types - [microsoft/TypeScript#6024](https://github.com/microsoft/TypeScript/pull/6024)
+- Nullable types - [microsoft/TypeScript#7140](https://github.com/microsoft/TypeScript/pull/7140)
+- Control Flow Analysis - [microsoft/TypeScript#8010](https://github.com/microsoft/TypeScript/pull/8010)
+- Mapped Types - [microsoft/TypeScript#12114](https://github.com/microsoft/TypeScript/pull/12114)
+- Rest Types - [microsoft/TypeScript#13470](https://github.com/microsoft/TypeScript/pull/13470)
+- Strict Functions - [microsoft/TypeScript#18654](https://github.com/microsoft/TypeScript/pull/18654)
+- Unknown - [microsoft/TypeScript#24439](https://github.com/microsoft/TypeScript/pull/24439)
+- Optional Chaining - [microsoft/TypeScript#33294](https://github.com/microsoft/TypeScript/pull/33294)
+- Node ESM Support - [microsoft/TypeScript#45884](https://github.com/microsoft/TypeScript/pull/45884)
+
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a

first_steps.md

@@ -22,8 +22,8 @@ file I am currently working on.
 
 ### Learn the debugger
 
-You'll probably spend a good amount of time in it, if this is completely new to you. Here is a video from
-[@alloy](https://github.com/alloy) covering all of the usage of the debugger inside VS Code and how it works.
+You'll probably spend a good amount of time in it, if this is completely new to you. [Here is a video from](https://www.youtube.com/watch?v=ChQ_sYjU8tU)
+[@alloy](https://github.com/alloy) covering the usage of the debugger inside VS Code, what the buttons do and how it all works.
 
 To test it out, open up `src/compiler/checker.ts` find `function checkSourceFileWorker(node: SourceFile) {` and
 add a debugger on the first line in the code. If you open up `tests/cases/fourslash/getDeclarationDiagnostics.ts`
@@ -38,7 +38,7 @@ You'll probably want to add the following to your watch section in VS Code:
 - `target.symbol.declarations[0].__debugKind`
 
 This is really useful for keeping track of changing state, and it's pretty often that those are the names of
-things you're looking for.
+things you're looking for. You can learn some techniques about [debugging the compiler here](https://blog.andrewbran.ch/debugging-the-type-script-codebase/).
 
 ### Getting started