useState hook in React is used to manage state in functional components.Setting Initial State: Initialize state by passing an initial value to useState.Updating State Based on Previous State: Use functional form of state setter to maintain up-to-date state.Updating Complex State: Use spread operator to update objects or arrays.Batching Multiple State Updates: React automatically batches updates for performance, but functional updates can be used for consistency.Lazy Initialization: Pass a function to useState for expensive initial state calculations.Resetting State: Store initial value in a variable to reset state.These methods provide flexibility in managing state in React applications.