It was good to learn scroll interactions that can be frequently used in practice. I think the overall difficulty level is between beginner and intermediate. There is no separate explanation of how to use CSS and JS in the lecture, so it would be good to study the basics and then take the lecture. There are so many advantages. 1. It was helpful to get used to the calculation method by using it repeatedly and easily in a field that requires a lot of calculation. 2. The process of converting jquery to vanilla was really educational. 3. The examples were not fragmentary but connected, so they were suitable for practice. 4. I think this is a class that those who focus on UI development or develop while designing should definitely take. 5. It was a magical lecture that could double the project cost if you know it. 6. Lastly, the voice was good, so it was not burdensome to listen. The parts that were inconvenient during the lecture were: 1. The one-line CSS that many people mentioned was difficult to see. I had to press enter on CSS before class and proceeded. 2. The video table of contents and the practice materials were often not aligned. I created a separate folder and proceeded. 3. There were some places where the sound was slightly empty in the middle of the video. --- Thank you for opening a good lecture.^^