SSB Log Entry 1037

So I posted some @pub.vaporsoft.xyz invites to BBJ (an internal BBS at tilde.town). I did a terrible job of explaining what SSB is, or how invites work. I've been using SSB for so long I may be out of touch with new tutorials / resources for a newcomer.

What's the best quickstart document to give to an #ssb newcomer in 2020?