Rust Reference
https://doc.rust-lang.org/reference/
Rust Standard Library
https://doc.rust-lang.org/std/
Rust Cargo Book
https://doc.rust-lang.org/cargo/
Rust rustup Book
https://rust-lang.github.io/rustup/
Rust API Guidelines
https://rust-lang.github.io/api-guidelines/
Rust unstable Book
https://doc.rust-lang.org/nightly/unstable-book/
Rust rustc Book
https://doc.rust-lang.org/rustc/
Rust rustdoc Book
https://doc.rust-lang.org/rustdoc/
The Embedded Rust Book
https://docs.rust-embedded.org/book/

Rust async-std Book
https://book.async.rs/
Rust tokio Book
https://tokio.rs/tokio/tutorial
Rust CLI (Command Line Interface) apps Book
https://rust-cli.github.io/book/
Rust macro Book
https://danielkeep.github.io/tlborm/book/
Rust Future Book
https://cfsamson.github.io/books-futures-explained/