Opposite Bishops are not always a draw

This is a game I played recently, and I ended up with opposite colored bishops up a pawn which is normally a difficult endgame to convert to a win, but I managed to do it.

If you hadn't won a pawn eariler 23...Bxd3! 24.cxd3 Rxe5 than the position was most likely a draw.

On white's part, 8.Bg5 seemed pointless in view of you causing it to retreat and gaining the bishop pair. Because the bishop was defended, there was no real use in your opponent pinning the f6 knight.

Overall, your opponent's play was positionally poor. In addition to the move given above, 13.h3?! served no purpose as the bishop would be taken anyway and now that the f-pawn was forced to take, the e-pawn was isolated and weak.

And finally in the opening, the instead of going to e7 on the fifth move black generally plays 5...Bb4.

The endgame is an easy draw because there's only one potential problem White has, the queenside pawn majority, which in any case is difficult to turn into a passed pawn.

Moves 35 and 36 made White's defense much harder. Just maintaining the tension with something like 35. Bd1 draws. In order to make progress on the queenside, or at least more progress than a blockaded passed pawn, Black needs to bring the king to the queenside, but that would allow White's king into the kingside.