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internal- used to denote code that is specific to your application and not meant to be imported or used externally. It usually contains the core logic of your application.internal/application- contain the higher-level logic of your application. This could include files related to the business logic, interactions between different parts of the application, and orchestrating use cases.internal/application/repository- to deals with data storage and retrieval. This could involve database interactions or other forms of data storage.internal/application/usecase- define and implement the operations that your application can perform.pk- contains code that could potentially be shared between different projects or modules. It means to hold reusable components.pkg/domain- where you define your application's domain models, which represent the core concepts of your application.pkg/http- to handling HTTP requests and responses. This could include routing, middleware, and other HTTP-related logic.pkg/ports- contain interfaces or contracts that define how different parts of your application interact with each other. It serves as a boundary between different layers, enforcing separation of concerns.