How to structure a large ASP.NET Core solution (layers, clean?

architecture, onion architecture)

• Use layered architecture: Presentation (API/UI), Application (services, business

logic), Domain (entities, business rules), Infrastructure (data access, external

services).

• Clean Architecture emphasizes separation of concerns and dependency direction

towards the domain layer.

• Onion Architecture structures the app around the core domain, with dependencies

pointing inward.

• Use projects to separate concerns and improve maintainability.