Thanks a lot @blesspatrick - I know how you feel. I've been here about 2 years now and there is a steep learning curve, I'm still learning now but hope to share what I know to make it a little easier!
Communities as in the hive communities? I believe they will all be on BOTH Steem and Hive chains but I can't speak for individual communities. I'll tag @steem.leo in here so that they might be able to answer - I also found a link to their Discord server that I had on a previous guide which you can join and ask them directly there.
RE: Bluffer's Guide to Steem/Hive - Witnesses, Governance & Forks