What is something that I can do to learn Rust better? I have been through the book, but that's it. What would help me really learn Rust?
Seriously, the best thing to do for virtually all professional or hobby work is to get more experience with it. Choose a project with small enough scope to give you encouraging results to keep that feedback loop going.
That was years ago though, perhaps it's better now. All I know is after reading Programming Rust, I picked Rust up and it's been amazing. I love the language.
Project Euler problems are pretty trivial (wrt coding) but might have some small useful nuggets. The code advent calendar from 2018 is pretty helpful too, and it’s much more code oriented than PE problems.
I’ve seen people suggest rewriting the GNU coreutils, and I really like the idea, but not quite enough to go sifting through all of the C headers and all to get to the finish line.
Honestly, it probably doesn’t matter much what you start coding as long as you’re coding.