The Rust Programming Language
by Rust Project
The official book — the best starting point for learning Rust from scratch.
Rust and WebAssembly
by Rust and WASM Working Group
Official book on compiling Rust to WASM and integrating with JavaScript.
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.