Read the text and his comments on the games.
My system (book)

@Kitten_in_a_pot I hope this helps:
Chapter 1: https://www.chess.com/library/collections/aron-nimzowitsch-my-system-2hG1bMYLn
Chapter 2: https://www.chess.com/library/collections/aron-nimzowitsch-my-system-chapter-2-2mKD4U2wG
Chapter 3: https://www.chess.com/library/collections/nimzowitsch-my-system-the-elements-chapter-3-2WPupEMRY
More collections when I get time to make them.
More games: https://www.chessgames.com/perl/chesscollection?cid=1033323
There is also a series on YouTube by Sean G Godley that reads through the whole book and shows you all of the relevant moves, e.g. here is chapter 4: https://www.youtube.com/watch?v=Etbur47manU
So I bought the "my system" (Aaron Nimzowitsch). My question is how to learn exactly from this book? I know it sounds funny but I have the "replay" all of the games? Or read the text is enough? And how can I learn from games? Please help me. Thank you if you will write an answer