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It is well explained in the help section of skool, here is the link: https://help.skool.com/article/183-how-do-points-and-level-work

After the marathon I know the right move is Nf2. To not fall into Zugzwang black should stay on the same color square as the knight. And the knight will change the color square every move, no way to get a tempo.

Yes of course, Kf2.

Kc2 and the black rook is trapped. If Rxd5 white can fork with Ne7 and win the rook.

Openings are often difficult for me. I understand the basic principles of openings, but there's so much theory—and I don't really know much about it anymore. If your opponent knows much more, you're often on the losing side right after the opening. I think it takes knowledge of the opening, middlegame, and endgame—none of it is easy 😅 . First, you have to get through the first two phases of the game to hopefully reach an equal or winning endgame.