In short
The stages a component goes through — mounting, updating, unmounting — and the hooks (`useEffect`) that let you run code at each stage in function components.
How to learn this
- 1Log messages in `useEffect` with different dependency arrays to see mount/update/unmount behavior.
- 2Compare lifecycle methods in class components to `useEffect` in function components.
- 3Learn the cleanup function returned from `useEffect` and when it runs.
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