i played this game on chesscube.com, it seems like a boring game, and there are very few tactics involved, but i believe i played a smart positional game (although i may be overlooking obvious blunders by my opponent)

8.Qd3 looks very strange. Why not just h3 instead?

16.Bxf6 looks simpler and better than Be3, 16...gxf6 (forced) 17.Nd5 etc.

18.Bxa7 is I think just crushing 18...Nxc2 19.Rc1 Nb4 gaining 2 connected outside passed pawns. If you had to defend the c-pawn, Rd2 looks better. You have to take into account what the best squares for your pieces are. Rc1 isn't doing anything to improve their positions, whereas Rd2 is keeping the Rook on it's best file, allowing your a1-Rook to also come into to game on d1 after playing a3.

Still, you were more than good enough to win easily, so well played.

Totally agree with westy1 , d5 was a very good square for your Knight and the exchange in f6 put your opponent castle in troubles taking with the g-pawn for not lossing the d-pawn after 16...Bxf6 17.Rxd6