It's a subject that needs to be handled with care (not something that always happens both at the table or in RPG books themselves), and part of my hope was having an explicit tag with good information would help us handle this topic well.
Can we make a good tag wiki for mental-health?
It's probably a good tag to have, look at these results
I'm hoping that's still a good number, and regardless it's definitely something people can be experts on in a way that's relevant and helpful here.
There's also a lot of talk about using roleplaying games for therapy and how it has helped some people with their mental health. The sort of mechanics in question are also frequently the topic for discussion, such as in this mythcreants podcast and this article.