In terms of "x for gamedev", what I would love to see is a fork of Brilliant that covers common topics from the basics up, using pseudocode only. I've always liked Cat-Like Coding's approach to tutorials, but I've never been able to "acquire" that knowledge (and an intuitive feel for it) in a permanent way like I have with Brilliant's method. I know that they have a CS module, but one specific to gamedev topics would be amazing.