Hello, HyoungSik Park! Thank you for leaving a valuable compliment after taking the big data course. In the case of the big data analyst, rather than learning locally, if you learn the overall context, and then understand the main theories and increase the learning difficulty of frequently appearing theories, I think it would be more efficient to learn. Based on the feedback from many of you who have taken the course, we will try to make the course a little more improved in 2023. Take care of your health during the changing seasons and have a nice day!