Learning Chess on Chess.com

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I am new to Chess.com. I bought the premium membership in hopes to learn to play better chess. I tried to learn an opening and randomly picked the stonewall with Magnus Carlsen. It starts with Magnus talking about the opening and then immediately goes into the opening with moves already played and Magnus asking "How should Black aim for the best possible Stonewall setup?"

It is literally like a skipped 50 pages into a book and started reading. What am I missing here?

https://ibb.co/HfZBCDhx