Explore an advanced approach to fetching data from APIs in React using SWR 2.0 Preload and Optimistic UI in this comprehensive 30-minute tutorial. Learn how to implement SWR React hooks for efficient data fetching, starting with an explanation of SWR and progressing through installation, setup with json-server, and creating an Axios API layer. Master the useSWR hook, understand mutations, and discover how to handle CRUD operations with added delay for realistic scenarios. Dive into SWR 2.0's preload functionality and the benefits of Optimistic UI updates. Follow along as the tutorial guides you through refactoring for Optimistic UI, creating helper functions, and implementing mutate with Optimistic UI. Conclude with a practical challenge to reinforce your newly acquired skills in this cutting-edge React data fetching technique.