Each directory represents a key component of NTA:
- The lib contains the 'core' domain code, and describes what types exist in the system (
entities) and what a user can do with them (operations) - The adapters provide functions to help the lib's operations achieve side effects
- The bindings take a lib plus adapters and make it responsive to messages from the outside world
- Each folder in apps combines the lib with adapters and a binding to make something runnable
These parts are explained in more detail on the docs page on project structure.