Learning Endgame Theory is all well and good – being able to win won positions when it counts is better!
Copy this FEN into your engine: 8/4b2k/3p2p1/4n3/7r/1N6/1PP3PP/4R2K b – – 0 39
In this position, Black has a big advantage. Take the Black pieces and play it against your chess computer and see if you can win. Play it out until there is a result and make note of tactics, ideas and difficulties. If you don’t win, start over and see if you can do better.
If you struggle, start again but swap sides and see how the computer makes progress against your defence. It is useful to get an idea of both the attacking plan and the defensive plan.