This lecture is full of advanced theories. I enjoyed it. However, I feel that the lecture flow itself is mainly focused on sequential code explanations, so the flow is interrupted, and I often find myself blankly wondering why this variable was declared, and then later realizing that it is used like this, so it is hard to concentrate. The code is complicated, and I think it can't be helped because it is a product of a certain scale. If you watch it three more times, it will be more noticeable. Thank you again for the great lecture!