Sites you should visit
YouTube – Important Endgames that People Mess UP!
At least the first 4 of these you should know by heart.
Ideal Chess – Checkmate puzzles and endgame practice
You should be able to do 10 Mate in 2 puzzles without a mistake
You can practice mate with 2 Rooks and a King against a lone King,
You can practice mate with 1 Rook and King against a lone King.
You can practice pawn and King against King – Queen the pawn!
Well worth a visit.