Everything in lecture goes in one ear and out the other. He seems like a nice guy but this really felt like a self-study class as lectures didn't really help at all.

The lecture was fast paced so I had to read the textbook to review. The quiz and midterm questions were fair as long as you understood everything. Both midterms focused on calculations. Prof. Liu gave proofs for nearly all theorems and lemmas in lectures, although you don't have to remember the proofs for exams. BUT you do need to know when and how to APPLY the thms and lemmas. The final exam was hard as usual: about half of the problems focus on calculations and other half focus on applying thms and lemmas to prove "unseen" results (try think of tricks and outside the box). The 24 hour window helps a lot when one has time to do some deep thinking to attempt those problems.

Overall, Prof. Liu's 132 is worth taking if you are ready to be challenged.

The lecture is rather boring and not very clear, so mainly depended on TA's discussion and office hour.
The textbook is pretty good for self-studying, make sure to do the exercise.
Homework straight out from the book and takes about 2-3 hours to finish per week.
Midterm 1 pretty easy, midterm 2 much harder, final is very hard. But the curve is nice.
Online timed quizzes (we had that due to the pandemic) are nightmares and took up a very large portion of the final grade.

TLDR: take advantage of TA and textbook, beware of the quizzes.

I would recommend studying by yourself if you are gonna take Professor Liu's class.
若想上刚哥的课,建议自学成才。