Whichever works best for you. I would recommend Wayland to anyone, but if you run into any problems with it (either bugs with your compositor or protocol limitations), then just use X11.

foot is great. Simple, fast, and customisable enough for my needs.

Why should beginners approaching web development stay away from WASM? I’ve used it a few times to create online demos of software I made in Rust and it was a very simple and painless experience to get it working in a website. I consider myself a beginner and I have not run into any issues with it so far.