Just signed onto Google+. Any hints for the totally lost on how to master it?

I’m certainly not a techie, but I do have a certain amount of computer know-how, if that makes any difference. I’m also fairly comfy with Facebook and Twitter, tho’ don’t often use Twitter. So far I’ve figured out how to send invites to friends but that’s about it. How pathetic is that? Ha Seriously, any hints are appreciated.