When should I lift state in React?
Only when siblings need to share the data. Lift it to their common parent. Do not lift everything to the top of the tree, which creates a giant, hard-to-maintain root component.
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More FAQs in React Data Flow Best Practices: Props, State, and Beyond
In one direction: data flows down through props, and changes flow up through callbacks. Respect this and do not push data sideways between siblings; lift shared data to a common parent instead.
Because duplication causes sync bugs. When the same data lives in multiple places, they can drift apart. A single source of truth keeps the app predictable and easier to debug.
No. If a value can be computed from props or existing state, compute it during render. Storing derived values creates synchronization bugs when the underlying source changes.
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