I've only taken the "Logical Play" course. As usual, I found the material excellent. Can't suggest much of a way to improve it.
I keep hoping that you'll provide a brief explanation of why the correct answer is the best one in the quiz, either within the quiz itself or as a separate document. That way a wrong answer is still a learning opportunity, which is why I'm taking this course in the first place.
Chess University has added some recorded mini courses to its student portal at ChessUniversity.com as listed below. We would love to get feedback from students who have taken these mini courses. Which of these was your favorite and why?
Dalton's Forcing Moves and Critical Squares:
https://chessuniversity.com/courses/understanding-forcing-moves-and-critical-squares-video-course-fm-dalton-perrine/
Dalton's Logical Play Move By Move:
https://chessuniversity.com/courses/logical-play-move-by-move-fm-dalton-perrine/
Lilov's Tactics Course:
https://chessuniversity.com/courses/lilov-tactics-course/