Category: React

Type props interfaces and useState generics.

Type useRef, useReducer, and custom hooks precisely.

Design components with clear props, composition slots, and minimal assumptions.

Compose UIs by nesting components instead of inheritance.

Understand HOCs as functions that return enhanced components.

Share code using a prop that is a function returning React nodes.

Preview images with URL.createObjectURL and upload safely.

Use Firebase for auth, database, and storage in React apps.

Sign users in with email/password or providers via Firebase Auth.

Read/write documents and listen to realtime snapshots.