There doesn't seem to be any location to find this information, and I have a few questions that don't fit with many of the current meta questions.
Meta is for questions about the site itself
Meta Role-playing Games Stack Exchange is the part of the site where users discuss the workings and policies of RPG Stack Exchange rather than discussing role-playing games itself.
Basically, if you have a question about RPG Stack Exchange, Meta is the place to ask. Browsing the questions on Meta will give a sense of the variety of topics covered back here, and browsing the list of meta tags will give another view of what categories of questions get asked & answered here.