Nice simple game,good endgame

Nice game of mine which I just finished playing.Hoping to figue out some of my mistakes even though I won.

4...e5? is an opening error and in fact doesn't gain a tempo.  after 5. Bb5+  white has a distinct advantage: Black's main reply, Bd7 cedes control of the d5 square after several exchanges.

I do not see how 10. Bxd7 is a mistake, as like I said previously, it prepared 12. Nd5. at this point, it is black, not white, as you had stated, who is "falling apart"

12...O-o-o loses a pawn after Nxf6

15. ...Qxb2 is too risky. how were you planning on dealing with the threat of 16. Rb2! and 17. Qxf7!  ?

moral: in sicilian games, you must cover the d5 square. you lucked out here, as in situations where white was "dead" he was actually winning. good ending, but pay more attention to opening principles.

thank you,and yes I'm afraid you might be right particularly to my opinion about certain places where white was "dead".If I seemed rude I apologize as it was a good game against a tough opponent.However I'm not so sure about 4.e5?

To me(again I'm still quite the begginer this seems like a fairly strong move.However after checking this whole beginning looks like a Sicilian dragon,which I didn't even know about at the time( or at least not how to play it),and in review Nf3 seems to be the best book response.

Uhhhh........ 17 Rc1 pinning the Q against the king is winning for white : 1-0 .

Again I was perhaps to hasty in my analyse,hopefully I will be forgiven for that and perhaps this game belongs not so much in the showcase but in the any. forum.