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I had the idea to collect the struggles that we (or atleast a non-empty subset of us) had during learning chapter 1. Very likely future learners will struggle with those same concepts, so we can save them some time. Also, it is encouraging to see that even the best do not grasp everything instantly :)
I will create one such thread per chapter. Later on, the answers can be composed by topic if need be. Let me now what you think and especially where you struggled yourself! I am also open for change in terminology. (Is No Pains, no Gains suitable? are struggle and resolution as used below the correct terms?) My proposed format:
Struggle: < A struggle in the form of a question or a description >
Resolution: < Short informal solution, optionally with the some formalism >