I took this course for the second time in January. At first, there were so many things I didn't understand that I just skipped over them, but as Kim Young-han said, after experiencing a small project in the wild and taking other lectures, I felt that I understood it better. When I first took the course, I wanted to leave a review, but I was so lacking that I couldn't leave my impressions and feedback, so I'm leaving it now. Thank you.