Yes, those are the sacred texts. I do believe the O'reilly book is worth paying money for. It's extremely well written, and I think it's painstakingly crafted pictures of memory layouts and thorough coverage of lifetimes and traits are tremendously helpful.
https://doc.rust-lang.org/stable/book/2018-edition/index.htm...
http://shop.oreilly.com/product/0636920040385.do