Mara Bos and O’REILLY have made Rust Atomics and Locks available online for free.
If the only thing you need is to create threads to handle different tasks that share no state, you won’t need this. But if you ware working on shared data-structures among threads, this books provides a full reference with examples that will help you step to the next level in Rust. Highly recommend!
I might even use this book to revamp my “Parallel and Concurrent Programming” master-level course.