I am going to start seriously advocating Hubzilla for CONfederated communities. Apart from having it installed (soon to be, as soon as I get to understand Docker), I would be happy to see some structured (perhaps as an infographics) view of various terms and features.
I can intuitively group them:
Identity, channel, privacy group, forum
But it will need time and practice to get relationships between them. So, perhaps someone did the job before?