1st Win, 1st Post
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Overall pretty good game. I won't go into detail, because it was such a long game. But let me introduce you to a friend of mine - Queen's Gambit. It starts as white playing d4. Then black has two well-known responses, d5 and Nf6. Let's go with d4 first. If black plays d5, it goes into exchange/accept/refused queen's gambit, so 1.d4 ...d5, now you offer the gambit pawn 2.c4, now black usually defends his d-pawn by 2...e6, 2...c6 or Nf6. If black takes, simply play e4 and gain the center.
From that point you can continue on your own, although there are a lot of lines continuing from that point. I recommend using game explorer.
Now 1...Nf6. This usually leads to King's Indian Defence, known as KID, and there black fianchottes his bishop to his kingside and castles while white gains control of the centre. Black tries to control the centre by indirect ways, while white goes more openly and directly.
Hello, and welcome to the site!
I won't point out all the mistakes in your game, but here are some of the more obvious blunders or inaccurate plays:
4. Bb5+ and 5. Bxd7+: Before these moves, the positions are symmetric. After the move 5... Nbxd7, they are symmetric except for the black knight on d7. In effect, you have allowed your opponent to develop a piece without achieving anything yourself. At your level, this is not outright horrible, but it's something you should keep in mind.
9. exd4: I would have played cxd4. When there is no ulterior tactical motive, it's best to capture towards the center with your pawns. By the way, look at your position here: you have developed one piece, and your opponent has developed three pieces. He has the superior position.
12. Rxe6??: You exchange a knight for two pawns (had your opponent moved his queen on move 13). Materially speaking, it's not worth it, and you get no other compensation.
18. Re1??: There really was no reason not to take the hanging knight on g4. Instead, this allows Bxh2+ (or Nxh2), causing you to lose a pawn.
30. Ne5?: You give up a central pawn for nothing.
Other than that, you won easily because your opponent kept blundering pieces. If you play against tougher opposition, you're more likely to improve your game better. But you'll get there with time (and a lot of played games). 
Thanks, Azukikuru for spending time for the mistakes.