- app
- applications
- infrastructure
- utils

The app folder contains the Next.js application. This is where the frontend code lives which is the presentation layer of the application.

The applications folder contains the business logic of the application. This is where the application services and use cases live.

The infrastructure folder contains the implementation details of the application. This is where the database operations happen.

The utils folder contains utility functions that can be used across the application.

The presentation layer is the frontend of the application. It is responsible for rendering the user interface and interacting with the user. The presentation layer is built using Next.js which is a React framework.

It would be in the app folder. And it would contain the following folders:

- _components
- api
- all other frontend code

The _components folder contains all the reusable components that are used across the application. This is conventional next.js folder to make certain folder private inside the app folder.