Learn what TypeScript is and why it exists.

Install TypeScript and configure tsconfig.json.

string, number, boolean, and other primitive types.

Type arrays and fixed-length, fixed-type tuples.

Define a set of named constants.

Understand TypeScript’s special types.

How TypeScript infers types automatically.

Create reusable names for any type.

Describe the shape of objects with interfaces.

Type function parameters, return values, and overloads.

Combine types with | and &.

Restrict a value to specific literal values.

Type object shapes, nested objects, and index signatures.

Mark properties as optional or immutable.

Override TypeScript’s inferred type with as.

Typed classes, constructors, and inheritance.

public, private, protected, and readonly members.

Know when to use each one.

Write reusable, type-safe functions and components.

Restrict generics with extends.

Narrow union types with type guards.

Partial, Pick, Omit, Record, and more.

Transform existing types into new ones.

Choose a type based on a condition.

Write your own type predicate functions.

Import and export types and values across files.

Describe the types of plain JavaScript with .d.ts files.

Annotate and modify classes and members.

Understand the most important compiler options.

Write maintainable, strict TypeScript.