No worries :) Even if you're following more communities than just the default News and possibly Maintenance, which are locked to Staff/Mods, Dreamwidth is still a lot less active than, say, LJ in its heyday. Some communities may only be hanging on at all because their moderators post. And it also depends on the types of communities you follow; a lot of fan and writing communities will have things like posting guidelines, but they may not come up in crafting communities, for example.

I'm happy to answer any questions you have about this sort of thing, BTW, and there are also communities dedicated to helping newcomers figure stuff out, if you'd be interested in anything like that :)