Should've done this a while ago, but I finally wrote contributing guidelines for niri:
https://github.com/YaLTeR/niri/blob/main/CONTRIBUTING.md
With many new users, the stream of issues, discussions and pull requests is quite overwhelming. 馃槄 You can help! And the contributing guidelines outline the various ways how.
I would especially appreciate help reviewing PRs, though I understand it's the more complex task out of these.
Big thanks to people already answering questions and helping others! 