This class dives deeper into some of the core topics of algorithm design, error correction, complex theorems such as Gottesman Knill, and more. A lot of the homework assignments are open-ended research questions and you need to put in effort to understand the problem at hand and be creative. The lectures are really engaging and help you think in the right direction. TA and professor office hours are super helpful too. But, if you struggled in CS 238, I would be cautious in taking this course. The difficulty is significantly higher.