I am trying to improve my endgame - help would be appreciated

I see you've gotten some more reponsenses since I posted a few days ago.  This might simply cover ground you already now know, but I created a video analysis focusing on the endgame.  I focus on three things in particular: 

1. When to transition into the endgame;

2. How to play the 'early endgame'; and,

3. How to generally evaluate Rook endgames.

Hope you find it useful.

https://www.youtube.com/watch?v=ZryZko_HJHA

1. when the endgame is in your favour, this not need to include material, in for example rook endings, activity is priority. and to find out when the endgame is in your favour, you must study endings (reuben fine books f.e.), there is no shortcut with this

2, normally as every other game, just be careful about pawns (regarding the bishoop colours), do not block position if you have bishoops, do not open position if you have knight vs bishoop, do not let "his" rook on your 2nd rank....many rules, again goes that you must study endgames

3. the hardest ones...

This is so awesome I don't even know what to say. You have yourself a subscriber. Thank you so much!

It's always disillusioning to think you played with great technique (as I thought about this game) only for the engine to pick apart your game afterwards, and you realize you played downright horribly. The endgame is something I have to improve upon. I found your video fantastic.

Read Dvoretsky's endgame manual

Why didn't White play 11. b4, to attack the trapped knight? ... Never mind. That was why Bxf3, to remove the queen's guard. Even the non-annotated game is instructional.

52. ... Kd6. Why not Kb4? I realize the strategy is to not trade into an endgame where the other king is closer to the pawns. I just thought the d4 pawn was Black's last hope of a 3-fold with the king dancing on b4 and c5. Although, I now see the white rook could just dance on a1 and b1, and the d4 pawn drops. If the Black king goes to d5, then Ra5+ wins.

At move 58, it is clearly game over. After Kxd4, the black king must choose between going after pawns guarded by the a3 rook while the white king chase off the a7 rook, or helping the rook while the white king attacks pawns that can not be guarded. Maybe the black king could have timed its steps better before kxd4, maybe first going to c6 or even pushing the d pawn to get the opposition. However, the White rook would just back up a square to make it Black's turn again. That is an advantage of having the active piece and space adavantage.

I am sorry but an computer would never play this moves. For example 9....Na5??  in stead of Qxd5.  My computer plays no singel move that is shown here. This game is impossible by black played by an computer.

https://2700chess.com/play-computer

That's what I played. It doesn't seem anywhere near 2000 strength. I also beat it at 2200 without much difficulty. My rating OTB is higher than on this new account - but I'm still nowhere near 2200 strength.