Should related state live together or separately?
State that changes together can live together in one slice or hook. State that changes independently should be separate, so changes stay localized and do not cause unrelated re-renders.
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More FAQs in How to Manage Complex State in a Large React Project
Categorize state into server, UI, and user; use the right tool for each, like React Query for server state and Context for shared state; keep state close to where it is used; and co-locate related state. Consider Redux Toolkit for complex shared state.
React Query (or RTK Query) for server state, since they handle caching, invalidation, and loading states for you. Redux for complex shared client state that changes often and interacts across many components. They solve different problems.
For state used by many distant components like auth and theme, Context. For one or two close components, local state. Lifting everything to the root creates a giant root component and excessive re-renders, so keep state close to where it is used.
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