As far as I know, posting other websites here is ok...with that said...
My main go to site is: Liveaquaria.com (the livestock website of drfostors&smith), it was one of the first sites I found that gives details on fish and plants. I still refer to it today.
, one way to verify info, is to compare what various websites, forums, and people say and whatever seems to agreed among them "should" be fact. No sure if this qualifies, but that's what I do lol.