Documentation
Everything is generated from the reference that ships in the compiler repository, so what you read here is what the compiler implements.
The Language
The language itself: syntax, the type system, ownership, traits, generics, async, and the foreign function interface.
26 pagesStandard Library
Module-by-module reference for std: the types, traits, and functions that ship with the compiler, from core up through collections, I/O, concurrency, and the network stack.
144 pages