1. if and loops
2. Readability is very good. Comments help.
3. pointers/references vs values
I think these are the only things that are truly universally necessary to understand, whether you're writing assembly, for the web, for a game, or anything else that executes code.
4. Version Control
I've onboarded some new grads, and was surprised to find they don't teach version control in college. Students generally picked it up on their own, but I'd kind of expect at least 5 min of the first lecture of CSCI 101 to be something like "here's git and here's why you need to use it".
If anyone wants such a reference, there's the "Missing Semester" which is all about practicum. Lecture 6 is on Git:
Lecture 6: Version Control (git) (2020) https://www.youtube.com/watch?v=2sjqTHE0zok
or how to post questions and copy answers posted on stackoverflow.com and make them fit in your own code.
I see a lot of comments on SO asking to tailor down the answer further for their exact problem.