Exploring Ybixo further
You made it to the end of the Ybixo book! Congratulations and thank you for reading. If you have any feedback on the book you'd like to share, you can do so by opening an issue. It would be very much appreciated!
If you want to work on Ybixo itself, you'll need to learn Rust and Ruby.
A good place to start learning Rust is its official documentation: https://rust-lang.org/learn/. Rust's documentation includes a guide also called "the book" which is very much like this one. You'll find that Rust is very similar to Ybixo. Now that you've finished the Ybixo book, Rust should feel familiar.
Ruby's official documentation also has lots of resources that will be useful in learning Ruby: https://www.ruby-lang.org/en/documentation/.
Now go write some Ybixo programs!