ZOMG how did you do that? I wanna do that too!! says you when you see a masterpiece here on dA, or anywhere else, and dont know where to start.
The purpose of this huge collection of tutorials is to give you a starting point.
That said these are other peoples methods, you have to find your own style, so be open-minded!
Becuase of the wide range, some of the tutorials arent from deviantART, Ill mark this with a (o) .
Since Nicephore Niepce made the first photography in 1826 (or 1827 by other resources), the art and method of taking pictures changed dramatically.
Guide to Giving Good Critiques by ThePhotoCritic - as the title suggests, it focuses mainly on the post-process: giving opinion, but contains such terms and techniques (Rule of Thirds, Color Terms, Lighting Terms, etc.), it worth a read.