Beginner/playeble against everything Opening for White

There is a pawn on e4. 

Just en passant it with the king. Somebody doesn't know his bongcloud theory.

I've found that the Czech Pirc is playable against most common White setups.

Openings are just as important as any other category, just not before  I would say 1800.

I think that positional and tactical understanding is needed. However still in that you need to know the priciples, and the knowledge of the opening.

Learning a few openings and becoming elite with them is better than learning 40 openings and being subpar with them. So it is true that yoi need to focus on your understanding, however later when youare about 1300-1400, that is when I believe the first wave of opening knowlege and theory needs to begin.

I don't even study openings heavily though, usually I just like using my intuition and understandings and I feel fine, opening preperation is needed heavily at the Super GM level, so it is true that opening preperation for your level won't be needed to at least a 1300 hundred jump from 700 to 2000. However then again 2000 really don't need preperation, I've played plenty, usually they prepare for certain lines however fall short if they see a line that they didn't study for. And if they didn't study for it, they play on intuition and understanding how chess is supposed to be played.

So @Steven-ODonoghue is right in a way, focus on the positional apsects of the game, improve in your tactics, and don't dive to heavilty on the openings. However do study the basic openings like 1.e4, the Sicilian, the Ruy Lopez: Morphy's defense, or if your white the Columbus variation/exchanged variation, I recommend the Columbus varaitation as that is the mainlined and much more structured approach to the game. Study the Italian and perhaps the Fried Liver Attack, maybe a couple of traps(however don't get used to playing hope chess, use traps only in unrated games and games for fun, never use traps or Gambits for real play unless your are comfortable with it and only when you are comfortable and have a great understanding of that Gambit only then can you use it and know what to do then just base moves off of your memory.)

Just play your game, don't rely to heavily on openings, and practice your tactics, get more experience, play more, get more knowledge of positions, and study crucial endgames such as K and Q vs. K or R and K vs. Q or King and pawn endgames and study those over and over until you have a masterful understanding of it. Once you do that your will be more proficient for the endgame, especially on your level. 

Look at the more crucial things to study for now and stick to it and then you will grow!

@hdbb8 it depends on what positions you are looking for, and what style you play as well.