In my full-stack applications, I manage state by using a combination of local state and a centralized store, depending on the complexity of the app. For small to medium-sized projects, I prefer React's built-in useState and useContext hooks to handle local state and share data between components. It's lightweight and works well for less complex needs. However, for larger, more complex applications, I rely on Redux or Zustand for global state management. Redux offers a robust solution with a predictable state container, which is particularly useful when dealing with complex actions and side effects. Zustand, on the other hand, is more lightweight and offers less boilerplate code, which I appreciate when I want simplicity without sacrificing functionality. I find that using tools like Redux DevTools helps with debugging and tracking state changes in real-time, making the process of managing state in large applications much smoother and more efficient.