It the same as building MVC just more structured architecture In clean architecture in spring boot the web UI is in MVC .In Clean Architecture, the layers are more clearly separated and defined compared to traditional MVC architecture. The core of the application is the Domain layer, which contains the business logic and rules. Services layer contains application-specific functionality and use cases. Infrastructure layer deals with external dependencies such as databases, external services, etc. WebUI layer is for handling the web presentation and user interface.

The main idea behind Clean Architecture is to enforce separation of concerns and make the codebase more maintainable, scalable, and testable. It helps to keep the core business logic independent of external frameworks and technologies, making it easier to make changes and updates without affecting other parts of the application.

In Spring Boot, you can implement Clean Architecture by organizing your codebase into separate modules or packages for each layer (Domain, Services, Infrastructure, WebUI). This way, each layer is isolated and can be developed and tested independently. Spring Boot provides features like controllers, services, repositories, etc. that can be used to implement the different layers of Clean Architecture.

Domain
Services/Application
Infrastructure
WebUI (MVC)

Feel free to learn for beginners from YouTube ,udemy and get some ebooks. Look at my beginners guide here I hope you are now able to create a real project using clean architecture in spring boot . Understand the class and file structure with architecture.

https://www.nairaland.com/7385642/spring-boot-tutorial-beginners