Explore JWT Authentication and learn how to persist login state on refresh in this comprehensive MERN Stack tutorial. Discover techniques for implementing JWT access tokens and refresh tokens in React with RTK Query and Redux, and master the art of maintaining app state during page refreshes. Dive into topics such as sending access tokens with baseQuery, creating a baseQueryWithReauth wrapper function, fixing useQuery unsubscribe issues, and developing a custom usePersist hook. Implement a persist toggle in the login form, create a PersistLogin component, and integrate it into your app for seamless user experiences. By the end of this 43-minute video, gain the skills to enhance your web applications with robust authentication mechanisms and improved state management.