Meta is the repository of knowledge about the main site's policies, along with all the discussion that helped reach those points. Unfortunately, it's also pretty difficult to search, let alone to read through in order to understand those policies!
As an initial step toward making it more useful, I'd like to suggest that we try to retag past questions on meta. There are 864 questions; limiting that to exclude bug and feature-request and only questions with positive score, it's reduced to 597 questions. A fair number of those are still not about policies (e.g. technical questions) but the extant tags aren't really good enough to sort through that. That's a lot of questions, but I think it's also pretty manageable, especially as a group project, if we know what tags we're potentially applying.
If we have a decent number of questions tagged like that, then we'd be able to use them to start putting together a canonical reference for the site's rules, sort of like what's in the "what can I ask?" but with more detail, and with links to examples and additional context.
So: what sort of tags/tagging structure might we want to use, if the goal is easier understanding of how the site works?
(As a reminder, questions can only have up to five tags, and one of those has to be the mandatory bug/feature-request/discussion/support tag, so our taxonomy needs to fit into four tags per question.)