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Adapters are implemented in different layers based on their function. Input adapters (like REST controllers) are at the application's edge to handle incoming requests, while output adapters (like databases) are in the infrastructure layer, interacting with external systems.

Repositories and domain services are interfaces in the application layer, implemented in the infrastructure. Entities should handle the core logic, while repositories manage persistence.

For UseCases, it's often clearer to have separate interfaces for each, but you can combine them if they are related. Naming conventions vary, but consistency and clear, descriptive names are key.

Your structure looks well-organized. Stick to clear separation of concerns, and you'll be on the right track.