I suggest that you simply pick an easy issue from the issue tracker and try to solve it. If you know programming, you can probably figure out how to get things work. For one thing you can always search for the specific error you are getting, and Rust gives very good error messages with suggested fixes.

This is how I learned Rust, because I dont like to read books about programming. Took me about 6 months fulltime to get really comfortable with Rust (before that I had programmed in Java/Kotlin for years).

Of course everyone learns differently, do what works best for you.