Hello. I run a small online business. I highly recommend all of Mr. Yoo Seong-min's lectures, including this one. All of his lectures are not superficial. ㅜㅜ He covers the practical aspects so well that I am becoming an expert. I have taken many lectures related to marketing, but if I had to pick just one that I can use right away, I would definitely recommend Mr. Yoo Seong-min's lecture. I learned a lot from Mr. Yoo Seong-min's Facebook lecture and am using it well now. I had additional questions about the lecture, so I sent an email, and his responses were very kind and I am receiving a lot of help. Thank you again. I will study hard and use it to prove my achievements.