State management

Kinds of state, Context, Zustand, Redux Toolkit, RTK Query and the alternatives.

1. 1Kinds of state and how to chooseLocal, server, URL, form, global — each with its own tool.
2. 2Redux ToolkitThe store, actions, reducers, createSlice with Immer and Redux in Next.
3. 3ZustandA minimalist global store: create, set with merging, selectors, persist.
4. 4RTK Query and the alternativesServer state in Redux, tags, and a comparison with TanStack Query, SWR, Apollo, RSC.