I'd like to join

[Narroo]

Welcome.
As the other have already pointed you in the right direction(s), I'll just add that the GitHub issue tracer has a special tag for tasks that we consider suitable for newcomers, search for issues with the "easy" label, if you see something you'd like to work on, drop a line there saying so; if you're not sure about how to go about that, feel free to ask there or start a new thread here in the forum.

Good luck.

Thanks!