I really need help with endgames

Try this excellent Endgame training site, Its free. :] - chess-endgame-trainer.web.app/home -

A good website is www.tomorrowtides.com/how-to-improve-in-endgames.html

I don't get what I did wrong in this rook endgame (I won at the end when my opponent blundered and then successfully checkmated them with K+R vs K, but look at all the blunders before that.