Summary  
This chapter covers best practices for managing application state with Redux, including performing all state updates inside reducers, selecting only the minimal required state in components, organizing data into separate slices, and maintaining a clear, consistent state structure.  

General domain of usage  
Front-end web applications

When working with Redux, most issues come from small mistakes in how state is used. Avoiding these early will save you a lot of time later.



## Common Mistakes

* Updating state outside reducers;
* Selecting too much state in components;
* Mixing unrelated data inside one slice;
* Using unclear or inconsistent state structure.







Keep state updates inside reducers, select only what is needed, and organize state clearly.


Note

Learn how to manage complex application state in React using Redux Toolkit. Understand when Redux is actually needed, build state with slices, handle async data, and connect everything into a predictable flow. 

Understand why Redux Toolkit exists and when it becomes useful. Recognize how state complexity grows in real applications and why simple approaches stop scaling.

Install Redux Toolkit and set up the store. Connect Redux to a React application and understand how data flows through the system.

Define state using slices and organize logic clearly. Create reducers, use generated actions, and keep state manageable as the application grows.

Read data from the store using useSelector and update it with useDispatch. Structure state correctly and avoid common mistakes when working with shared data.

Fetch data from APIs using createAsyncThunk. Manage loading and error states and keep the UI in sync with async updates.

Split state into multiple slices and organize files by feature. Combine reducers cleanly and maintain a clear structure as the application grows.

Build a complete application using Redux Toolkit. Implement CRUD features, handle async data, and improve the user experience with loading and error states.

Avoiding Common State Management Mistakes

Common Mistakes