Still struggling with engames

I need advice on what and how to study to improve my chess endgames. Any contribution is appreciated
thanks

You play 15 10 chess but ended up with more than 17 minutes when you lost. It takes time to figure out the right moves in complex positions.

If you don't take the time, you will often make the wrong moves.

This is the position where you lost the game. You had a clear advantage. You were up by a pawn. Perhaps you saw that your f2 pawn was attacked twice and defended only once. Your b2 pawn was also attacked.

If you take the time, you can forecast exactly what is going to happen if you play Re8+ here. Black will trade his rook. You will give another check on e8 and the the black king moves to d7.

The question is then what? Both your rook and your b pawn will be under attack. What are you going to do?

Maybe you should think for a while about alternatives to 21 Re8+ and whether there is a way to protect your b pawn and your f pawn.

Go ahead. Take at least a minute or two if you need it to figure it out. You had plenty of time available to you.

I agree with the previous speaker. And your errors are not about endgame technique in the first place. You squander your pawns as if they are weeds in your backyard. You end up giving your opponent's pawns a free run to the promotion line without creating any such opportunity for your own soldiers. So start calculating how to protect your pawns and pick off those of your opponent. And then you can learn that some pawns are more important than others. But hardly ever will you win an endgame after completely neglecting the fate of your pawns.

I think the right move in this position should be Re6 to Re2 to defend both pawns and attack the rook on d2, but I think that I don't have a clear understanding of how to play the endgame in general, so when I try to simplify position I made a lot's of mistakes

I remember watching some youtube videos and also just playing unrated matches against friends or people and thinking a lot in the endgame to position my piece to either 1) be active on their back ranks to take some backward pawns or break their pawn chain. 2) protect myself by becoming a fortress or lock up their pawns with mine and control as many files as possible.

Complex positions or many available choices, you should take time to think up to even 40-60+ seconds (that's around my average) while for endgames it'll depend if you're either losing or winning, but should still take time to factor in the moves on both sides and see who gets the first initiative like who takes the pawn first or check or who can get to their desired position first. This is my own experience because my opponents sometimes don't even use their clocks while I'm down to like 3-6 minutes.

There is a simple solution and you aren't going to like it because it takes hard work. Get Silman's Complete Endgame Course, get out an actual board and pieces, sit down, and study. At an hour a day, this book should take you a few months to complete! You actually have to put in the time to understand it. Figure out the moves, etc. You do not study a book rapid fire. This isn't some 20 minute garbage video. This is real work.

Every amateur has their struggles somewhere. For some it is openings. For some it is Middlegame. For some it is endgame.

First step is acknowledging your weakness. For myself it is the middle game. I know the B+N mate, Luncena's, position, Vancura's Position, Philidor's draw, the short side defense, long side defense, Bahr's rule, corresponding squares, etc. I get killed in the middle game in the games I lose 9 times out of 10, if not more than that.

The next step is to get off the computer screen and doing some serious hard studying rather than playing a bunch of bullet and blitz.

1) you have to have an active rook. a passive rook is like playing down a piece. cause it's not doing anything.

2) protect your pawns. you have to think of each pawn as a little baby queen. they are that valuable.

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