go to the endgames tab inside the blue hat tab, or analyze your previous endgames
How To Practice Endgames?

Free chessable lesson on endgames here. Its not comprehensive (its a short version of Jeremy Silman's book/course on endgames), but its free and has exercises for you to practice...might help you out a bit: https://www.chessable.com/course/210380/

Silmans book is really good, and you can use Chesstempo endgame trainer here: Chess endgames (chesstempo.com)
(For chess tempo you have to create a free account before using it)

go to the endgames tab inside the blue hat tab, or analyze your previous endgames
These are useful, as are the endgames on Lichess.
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I use books. As I read them, I play the positions against Stockfish on my tablet. I'm currently going through an old out of print book that I bought used a couple of years ago: Mednis, Practical Rook Endings.
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Averbakh, Chess Endings: Essential Knowledge is a good one to start with. Capablanca, Chess Fundamentals has basic endings every chess player should know. Pandolfini's Endgame Course also contains the basic positions on which more advanced study is built.
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Silman's Complete Endgame Course is popular because it is clear and useful. I've gotten the most from Dvoretsky's Endgame Manual, but it is too advanced for anyone that doesn't know how to study selectively. You simply cannot get through the whole book if you are under 2400.
http://chessskill.blogspot.com/2024/03/64-endgame-books.html

To learn endgames, I would recommend GM Daniel Naroditisky's YouTube Endgame Series: https://www.youtube.com/playlist?list=PLT1F2nOxLHOfQI_hFiDnnWj4lb5KsviJ_ In these videos, he goes through endgames with every type of piece and explains, not just how to play an endgame, but why you move the way you move.

I've played lots of games recently where I had many winning positions and simplified properly but wasn't able to win the endgame although clearly winnable. I just want to know some way of being able to Practice endgames.
Do you have a tablet? I would set up this game https://www.chess.com/game/live/108534622915? after Black's move 49 and play against Stockfish on my tablet. The app is free. You will learn a lot trying to draw Stockfish from this position.
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Of course, carefully go through this site's analysis of that game first to understand the many errors that were made both by you and by your opponent.
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You can also use this site's features to play the position against the computer. Note the target in the lower right while going through computer analysis.

Silmans book is really good, and you can use Chesstempo endgame trainer here: Chess endgames (chesstempo.com)
(For chess tempo you have to create a free account before using it)
Real. Silman is the best

Like said above, l*chess has some really good lessons that could help you a lot. Also, there are some good lectures on YouTube by Yasser Seirwan and Ben Finegold that I found helpful. Daniel Narodisky also has some good YouTube speed run series dedicated to this type of stuff. Hope this helps!

Silmans book is really good, and you can use Chesstempo endgame trainer here: Chess endgames (chesstempo.com)
(For chess tempo you have to create a free account before using it)
Real. Silman is the best
Silman is good. Averbakh, Dvoretsky, Rabinovich are better.

To learn endgames, I would recommend GM Daniel Naroditisky's YouTube Endgame Series: https://www.youtube.com/playlist?list=PLT1F2nOxLHOfQI_hFiDnnWj4lb5KsviJ_ In these videos, he goes through endgames with every type of piece and explains, not just how to play an endgame, but why you move the way you move.
These look good. I watched half of the first video. His explanations are clear.
I've played lots of games recently where I had many winning positions and simplified properly but wasn't able to win the endgame although clearly winnable. I just want to know some way of being able to Practice endgames.