The content is really good, but I feel like the lecture preparation was lacking. Just like the lectures I took before, the readability of the notation using the mouse is so poor, which is disappointing. Additionally, some lectures had unstable volume due to microphone issues, and these parts could have been easily fixed by checking after recording, but when I see the videos uploaded as they are, I feel like they were not properly prepared. From the perspective of someone who is paying to listen, the lecture content is really good, but I wish they had paid a little more attention to the external aspects when recording.