Theoretical endgames

I don't know if there is any practical value of knowing such endgames. Perhaps it's better to spend money on practical endgame texts.
https://www.newinchess.com/media/wysiwyg/product_pdf/7627.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7647.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7648.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7697.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7706.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7809.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7887.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/7931.pdf
"UNTIL YOU ARE MASTER STRENGTH YOU DON'T HAVE TO KNOW MORE THAN ABOUT TWO DOZEN EXACT ENDINGS." - GM Andrew Soltis (2009)
(He also thought one needed to know a similar number of "endgame techniques".)
https://web.archive.org/web/20140708094523/http://www.chesscafe.com/text/review916.pdf
I found a great series on new in chess shop.
https://www.newinchess.com/the-modern-endgame-manual-vol-1
https://www.newinchess.com/the-modern-endgame-manual-vol-2
etc.......
https://www.newinchess.com/the-modern-endgame-manual-vol-8