And if you learn 100 prescribed endgames without knowing why the moves should be made, you will end up a rote monkey and forget them years, if not months, later. Maybe you need to lose some to force it into long term memory and enjoy the game more.
Chess is not a puzzle, stop treating it like that.
There are 100 endgames you should know to get better at chess. Studying the endgame is a very important chess skill. Without knowing the endgame you would lose a lot of games in the endgame phase. You will have to study the endgames like king and pawn endgames, rook endgames, bishop endgames, knight endgames and queen endgames and much more endings.