If you truly want to build a commercial service, this lecture is the best. It shows how to ask AI about necessary fields, learn from it, and systematize that knowledge to build a service. I think this is what matters most in today's world. Rather than just rushing toward a finished product and showing the final result, it vividly captures the process of creating a service in an unfamiliar field, so I learned a great deal. I thought I was quite proficient at using AI, but I was mistaken. I used to just ask a question or two out of curiosity, get an answer, and that was it. It seems programmers use AI to explore necessary fields and engage in much deeper conversations than I imagined, refining the AI's responses through numerous questions. I think this is a crucial point. I personally tried out the Saju (fortune-telling) service before paying, and since I found it reliable, I took the course. To be honest, I've always had a small wish to create a Saju website. I vaguely thought I could just give the AI a birth date and get an answer, but I was dead wrong... Also, at first, I felt like I wasn't studying enough because I wasn't typing out every single line of code. However, it made me realize that in the age of AI, the way we learn and study must also change. Meeting this lecture feels like a stroke of luck for me. I highly recommend it.