I'll answer a couple of these that are related to my side of things.
-The second one is, it's just like pure Yuri, right? Like girl x girl? Is Futanari categorized as Yuri too? Like enhanced Yuri or something?
Futanari and yuri, for the sake of the tags, are considered separate categories here. This isn't likely to change. When you look at the tags for one or the other, at least in that sense you know what you're in for.
-The forth one is, what's the different between Drama & Angst? Is it just like more into something?
Drama is, as the word suggests, a story where drama is the focus. Angst refers to stories that have a character agonizing over something, often at length and sometimes in a melodramatic fashion.
-The fifth one is, is this an opening forum? Like you can ask anything as it's still in normal line. If it is, then there's a problem that I want to ask the advice from you guys. Because I hope there's a person (At least) who can help me.
I think this means can you create a topic, as you just did with this thread? You can do that, but restrict it to things like yuri manga, anime, and other things relevant to the site. This isn't a general life advice forum.
-The sixth one is, is there any new upcoming pure Yuri animes? Like Sakura Trick? Because to be honest I'm waiting for ages and ages like mosses and hoping there's a Yuri anime that similiar to it. I'm waiting since the last Sakura Trick came out in 2013 if I'm not forgotten. To be honest, I don't like Netsuzou Trap and I'm not into NTR.
There is an anime thread, which would probably be the best choice to ask. A couple of people might give you answers here too, of course.