Tabletop Rpg posts, content, and recruitment posts.
Recruitment posts should contain what system is being played, CW for any adult/serious themes players need to be aware of and whether a game is beginner friendly.
An obvious reminder of no racism, sexism, ableism, homophobia and transphobia.
Emphasis on small independent rpgs like the ones in the TTRPGs for Trans Rights in Texas but not against dnd stuff.
I'm very impressed by the Mothership 1E GM book. While a lot of GM books are full of supplementary procedures (like D&D games) or just lore books (glares at the Delta Green Handler's Guide), the WOM is actually about how to be a good GM: how to design adventures, work with your players, build tension, use themes, etc...
You'd just need to read it cover to cover. Everything you've mentioned is in the book, but I just highlighted a section that I thought was nice and a good example of the layout. The bulk of the book is about designing sci-fi horror adventures, and this is around the half-way mark about implementing prep and running sessions (and then the back half of the book is about tying multiple sessions into campaigns).