Yes, the bane of the self learners. Explanations often omit "you don't need to know this" bits because it's crystal clear to the explainer but you're left with

Yes, the bane of the self learners. Explanations often omit "you don't need to know this" bits because it's crystal clear to the explainer but you're left with big gaps in the shape of black boxes in your understanding. Until you can piece it together from other explanations that omitted different bits.