princeable of two weakneses

A beautiful pawn endgame,based on the princable of two weakneses.Love some feedback as I did make several large blunders during this game.

Really cool! nice job with the king move dude.

4...Nxd4 is a mistake.  White brings his queen to a powerful square where it cannot easily be chased away (usually the knight it just captured would do this by going to c6) and hinders black's development.  4...Bc5 is probably best. 

7.Bb5+ was not solid.  It was a mistake.  Even without the pawns as they are in the centre that is a poor place for the bishop. 

16...Bd7 looks wrong to me.  The bishop is pretty bad there and also loose.  Why not Be6 blocking the e file, and covering d5, perhaps looking to gang up on the week pawn on d4. 

17.d5? sort of the right idea but that rook needs to be moved first. 

17...Rae8  Probably best to take the pawn with 17...cxd5

20.Bxc6 makes more sense to me and white looks much better.  White should probably either be much more active, or a pawn up in that endgame. 

Then follows some silly moves.  White needs to develop his rook.  Black needs to be more active with his rook.  Why not 20...Re2, same on 21.  h4?! Re5?! 

22.Re4 is better than Rf5.  How is white to defend his pawns?  23.g3 Re3 (if 23.f5 Rxh4) 24.Kh2 Re2+ (or 24.Kf2 Rf3+) Black is winning at least a pawn, and white still hasn't developed his rook and has a weak king. 

Good job winning the ending.  Shows the power of an outside passed pawn in an ending.

I still don't know why he didn't dev. his rook.Really never made any sense to me at all,however I must say I didn't do much better with my rook,moving it to quite a few useless squares.28.Rd1 was I think out of sheer fustration,since it really was quite bad.However on my end,what was I thinking with moves like 6.d5?

Flip the board if you are showcasing as Black.