Route Configuration
Using a file-system-based router, Next.js allows for:
Routes are defined using folders. A route is a single path made up of nested folders that follows the file-system hierarchy from the root folder all the way down to the leaf folder that contains the page.js file. Check out Defining Routes.
The user interface (UI) displayed for a route segment is made using files. View the unique files.
For better understanding, please read the nextjs routing documentation:
How to add a new page?
Inside the app folder, make a new folder, and inside that folder, make a file page.jsx.