Lichess Study Used In The Video:
https://lichess.org/study/TaG3ZARi
0:00 How to checkmate
0:50 Pushing the king into position
2:09 Chasing the king
4:33 Technique 1: Pushing the king back 1 row at a time
7:23 Technique 2: Boxing the king in with your rook
15:15 Technique 1 example game vs. computer
16:53 Technique 2 example game vs. computer
To master this endgame, try to win 5 times in a row against the computer from random positions such as these:
https://lichess.org/analysis/8/8/8/8/...
https://lichess.org/analysis/R7/8/8/8...
https://lichess.org/analysis/K7/8/8/2...