Actions: A new feature streamlining state management and side-effect handling.

New Hooks: Introduction of useActionState, useFormStatus, and useOptimistic to enhance functional component capabilities.

Server Components and Server Actions: Improved support for server-side rendering, enhancing performance and SEO.

Enhanced Hydration and Context API: Improvements for better performance and developer experience.

Support for Document Metadata, Stylesheets, Async Scripts, and Resource Preloading: Facilitating more efficient and organized application development.