The Rust Programming Language
by Rust Project
The official book — the best starting point for learning Rust from scratch.
The Rust Compiler
by Rust Project
The rust-lang/rust repository — read the source to understand how Rust works under the hood.
Related resources
Rust by Example
by Rust Project
Learn Rust through annotated examples covering core concepts and the standard library.
Rustlings
by Rust Project
Small exercises to get you used to reading and writing Rust code.