Thanks for asking. Overall the wikis are great starting points. Thinking back to a couple of years ago when I received developer access to the Gramps project in Mantis I relied on the wikis, and remember thinking that a clear flow for a bug in terms of status and resolution would be very helpful. There’s a Mantis flow diagram in one of the wikis but I remember that the Gramps flow was not exactly the same so I ended up making my own (see Final Status of bugs - Closed, Resolved, or either?).
There’s also another thread I started recently which relates to this wiki: Merging fixes from maintenance branches to master.
These are the things that come to mind, but in general anything that would help someone learn ‘the Gramps way’ of bug triaging and be become a contributor to the project. Does that make sense?
[10 Jan 2024: Updated to include link to thread: Final Status of bugs - Closed, Resolved, or either?]