TypeScript is JavaScript with a type system layered on top — it catches entire categories of bugs before your code ever runs, makes large codebases far easier to navigate and refactor, and has become the default choice for serious frontend and backend JavaScript projects alike.

This tutorial series takes you from basic type annotations to advanced type-level programming. You'll learn interfaces and type aliases, generics, union and intersection types, narrowing and type guards, utility types, and advanced patterns like conditional and mapped types. Whether you're adding types to an existing JavaScript project or starting fresh, these tutorials will build a deep, practical understanding of how TypeScript actually works.