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← All coursesHow React Works6 levels · 28 lessons

JSX does not call your component~9 min
Props, state, and identity~8 min
Render and commit~7 min
Where your state actually lives~8 min
The Rendering Model · Review~5 min

The rules of hooks, and why~9 min
Effects against the lifecycle~9 min
Custom hooks as contracts~7 min
The dependency you refuse to add~7 min
How Hooks Work · Review~5 min

Refs & the DOM~8 min
Lifecycle edge cases~6 min
Why a store change does not re-render your component~7 min
Escape Hatches · Review~5 min

Concurrent rendering~8 min
Suspense boundaries~7 min
Transitions in practice~7 min
Hidden, not unmounted~7 min
Concurrency · Review~5 min

Memo & referential identity~8 min
When memo does not stop a render~7 min
Context and which components re-render~7 min
What React Compiler already memoizes~7 min
Performance · Review~5 min

Server components~8 min
Forms and actions~8 min
Boundaries in practice~7 min
Server & Forms · Review~5 min

Course

How React Works

Predict what React re-renders, which state survives a change, and when each Effect runs.

Start free: JSX does not call your component

The levels

Level I · 5 lessonsThe Rendering Model