I’m going to echo what others have said here but hopefully clarify it somewhat. For most FOSS projects you can contribute by code, documentation, writing/reviewing bug reports, or other project management tasks. The projects probably have a “Contributing” section on their website that will help you get started and might even have an “easy tasks” or “good for beginners” section.

If you’re primarily interested in contributing by writing code, then you need to learn to code. Pick a language that a project you care about is written in and find the beginners tutorials.

You going to want to learn the basic tools the project uses even if you’re not writing code just so you can interact with the project’s community, so probably git, their bug tracker, and whatever they use for documentation and translation.

And don’t be surprised if it takes a while to get that first contribution in. FOSS developers tend to become grumpy with time and generally have high standards, and due to the massive amount of LLM slop being thrown their way these last few years have often become even more so. But your work will be appreciated if you stick with it.