Simple (not deep in theory or moves) Openings for White and Black? I am at the point where I want to learn some simple openings for White and Black.  By simple, I mean, openings that do not have a deep theory and don't take a lot of moves to get into.  Currently, I have been playing the Evans Gambit and Smith-Morra Gambit whenever I get a chance.  I have heard that the Colle System and London System are good beginner openings (I am confused by the word "system" here, are these actual openings?), so if anyone can elaborate on this, that would be helpful.  If I don't get a chance to play the Evans Gambit or Smith-Morra Gambit, I just play to the opening principles.
There aren't really any good openings without theory, but that doesn't matter -- you don't have to know the theory.

As white, I think you should play 1.e4. The Morra and Evans gambits seem fine to me at low levels, although the latter can be avoided. If 1.e4 e5 2.Nf3 Nf6, you will play against the opening I recommend you to use as black below. The game is likely to be quite equal for a while and the best player will win. Against 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6, there are a lot of gambits to play along the lines of 4.d4 or 4.0-0, 5.d4 that may be interesting.

Against the French and Caro-Kann you can get experience with isolated queen's pawn positions, more or less the most important of open positions at all levels. Isolated queen's pawn positions are tactical and show up in lots of openings. Play 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 and 1.e4 e6 2.d4 d5 3.exd5 exd5 4.c4, and develop quickly (knights first, castle short, etc).

As black, play classically -- answer 1.e4 with 1...e5, and 1.d4 with 1...d5. Against 1.Nf3 and 1.c4 and the like you can usually play 1...e6 and 2...d5 to get something similar to your 1.d4 lines. The idea of the classical openings is to get a good foothold in the center, trying to get an equal game first and worry about getting a better position later.

Against 1.e4 e5 2.Nf3, why not the Petroff 2...Nf6. Black doesn't have many problems in the lines after 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5, and can try to keep his knight actively placed on e4.

Against 1.d4 d5 2.c4, play 2...e6. The goal is to stay strong in the center and develop, e.g. by Nf6, Be7, 0-0, Nbd7, b6, Bb7.

There are of course many many more lines, but I won't put more in a single answer to a really broad question...