8 Reasons to Use React Query" is likely a presentation discussing the benefits of using the React Query library for managing and caching data in a React application. The slides may cover topics such as efficient data fetching, automatic caching and stale-while-revalidate, real-time updates, and easy-to-use hooks for handling queries and mutations. Additionally, the slides may also highlight how React Query helps improve the performance, developer experience, and user experience of the application.