According to the official NextJS documentation, the practice demo files help in learning NextJS.
Include Routes, Pages, Layouts, Root Layout, Template, Loading, Error Handling, Not Found etc.
Display the content of the article corresponding to the id parameter in the URL.
Mark the folder as a route group to prevent the folder name from being mapped to the URL.
Render one or more pages simultaneously or conditionally within the same layout.
Intercept other routes in the current route and display content in the current route.
In a front-end and back-end separation architecture, the client and server interact through API interfaces.
React Server Components allow you to write UI that can be rendered and optionally cached on the server.
Caching stores data so it doesn't need to be re-fetched from your data source on every request.