The docker-compose.yml in the Lemmy GitHub repo (here) uses the tag '0.4.0-beta.19' for the pict-rs docker image.
The current stable image for pict-rs is 0.4.1. Is there somewhere I can go to check the supported versions? I couldn't see anything obvious looking through the Lemmy GitHub issues/PRs.
This is really good advice. I'd say try to pick up the basics by following along with a tutorial or two so you understand the syntax and core concepts and then move on to implementing some simple gameplay mechanics that you're interested in. I've seen people fall into an endless loop of doing tutorials, but without having an actual reason to keep pushing yourself it's easy to lose motivation.
Making games can be incredibly rewarding - it's all about getting into that positive feedback loop by seeing progress on projects you care about.