Half of the items the poster lists as "wish I'd known" are things which were literally part of the curriculum when I taught C at my alma mater (Technion IIT, Ha

Half of the items the poster lists as "wish I'd known" are things which were literally part of the curriculum when I taught C at my alma mater (Technion IIT, Haifa). And then, some things are better not know - like cppreference, which would just confuse you with a lot of C++, which is interesting, but not relevant. Also, there are some nitpicks to make, like about array decay etc. More generally: We can't expect to know a lot of context before learning anything. You have to learn things in _some_ order. It's better to know C when you study PDP assembly, and at the same time it's better to already know PDP assembly when you study C - as you have insight into the motivation of what's possible via the language syntax itself. Same thing for Calculus and Topology: The latter course helped me understand and generalize a lot of what we had done in the former, but without the former, I wouldn't have had proper motivation for the latter, which might have seemed like useless sophistry.