I’ve been thinking of contributing to foss projects with more than testing and bug reporting. I want to contribute to mainly open source game engines. There are a few that are mature and underrated, but lack any documentation for a user to get started. This is why I decided to do documentation, but I don’t know where or how to start.
Is there any general rule/guidelines for getting started with this ? I’m looking for anything that can help a beginner documentation writer
So they have existing documentation? If so see if they have a style guide for how they want info presented. Assuming you are writing to official docs.
You can also look at other projects how their info is presented
You can often search for “[your topic] university pdf” to find good resources.
Here is one of the results I found searching “technical writing university pdf”
Maybe there is more when searching for “writing documdntation university pdf”.