How-to guides for non-language features

Explorations

Deep dives (handbook updates?)

Why and How?

Why are function parameter types bivariant?
How do I handle this in my program?
When should I use instance methods vs prototype methods?
How do I write a definition file? Walk through an example
Advanced version: Choosing between overloads/optional params, use {} instead of any, etc
How do I convert a JavaScript file to TypeScript? Walk through an example
Advanced performance optimizations for rest and optional arguments

Well-intentioned C# programmers