Rust

Language-level reference. Focuses on the parts that matter most in production: memory model, async runtime, concurrency primitives, and idiomatic patterns.

Subsections

Ownership & Memory	Ownership rules, borrowing, references, lifetimes
Async	Futures, async/await, wakers, async patterns
Concurrency	Threads, Arc, Mutex, channels, atomics, Rayon
Patterns	Error handling, builder, newtype, typestate
Smart Pointers	Box, Rc, Arc, Cell, RefCell, Cow
Unsafe	Unsafe blocks, raw pointers, FFI, invariants
Memory	Stack vs heap, allocators, drop order, leaks