Klunk> I'm guessing the answer to the above question will be something along the lines of, if you are a serious player.
My answer, based on your chess.com rating, would be that if you want to become a stronger player, learning basic opening principles is enough for now... focus most of your energy on mastering simple tactics (forks, skewers, discoveries) until you can see them without thinking. That's where you will win or lose games.
Once you go a few games without hanging any pieces or pawns then you should certainly consider learning more about strategy and openings.
> how many openings do you know, to how many moves?
A few very deep. Many to a few moves. But tactics, endgames, and strategy have all decided more of my games than openings... then again, it's somewhat artificial to dichotomize a game. I usually study openings by studying master games, but studying master games usually increases your knowledge of all phases at once.
I have been playing chess for a few years now, but have only really started playing lots of games in the last few months (I have 25-30 games going at the moment). This is just something i'm curious about, is it necessary to learn mountains of theory behind lots of openings, and how many openings do you know, to how many moves? I don't know any real opening theories, move two is as far as it goes and i just wondered how many players actually know the main line for lots of openings.
I'm guessing the answer to the above question will be something along the lines of, if you are a serious player. In which case, how would you suggest learning openings (playing, reading, discussing) and are there any that a player should know (particularly d4 and e4 openings)