The answer
Because it builds on understanding state and props. Once you know how data flows, learning to compute derived values during render instead of storing them is a small but important step that prevents sync bugs.
A Roadmap to Mastering Data Handling in React
Why learn derived data last in this roadmap?
More FAQs in A Roadmap to Mastering Data Handling in React
In order: props and state, controlled inputs, data fetching, lifting and sharing state, Context API, forms and validation, derived data, and finally state management libraries when the app outgrows Context.
Props and state. Understand props as read-only inputs from a parent and state as internal data the component owns. Master passing props, lifting state, and the one-way data flow before anything else.
After you understand props, state, fetching, and lifting state. Context solves deep prop drilling, so learn it once you have felt the pain of threading props through many levels.
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