Reference
This section is the detail layer. The guides will get you working; the concepts will get you reasoning correctly about what's running; the reference is what you reach for when you need exact signatures, exact wire formats, and exact behavior in edge cases.
Reference pages are organized by surface — the event-bus API, the adapter trait, the filter grammar, the subprotocol registry, the capability schema, the wire format, and the error taxonomy each have their own page. Each is meant to be navigable rather than readable; you'll typically open one to answer a specific question.
If you're new to Net, start with Concepts and Guides. Come back here when you need to look up a method, a field, or a constant.