Hey there! I wrote the course and you're spot on: the course is meant for classroom training (at Google and elsewhere). If you have the time to read a book, then I highly recommend diving into one of the many great Rust books. I've linked some of the freely available ones here: https://google.github.io/comprehensive-rust/other-resources.....

We've made an attempt at making Comprehensive Rust useful for self-learners by providing speaker notes on many of the pages. However, they're still quite terse and could be expanded in many places. PRs for that will be gratefully accepted :-)