Comment by caffeine

For your second Rust book, I'd highly recommend the Nomicon!

https://doc.rust-lang.org/nomicon/

Please ignore all the gatekeeping marketing on that front page - it's very counterproductive and not at all accurate. IMHO all of this material should just be included in the standard Rust book, especially the sections about ownership and implementing Vec.

The Nomicon is an extremely useful resource because it "desugars" all the magic that is happening when you write Rust, so you are left with a competent understanding of what the compiler is doing on any piece of code you are looking at or writing.

Valuable reading for people wanting to build real systems in Rust, IMHO.