I knew NextJS, but I didn't know the theory well and only knew how to write code. That's why I bought the course and studied it, and I was surprised by the detailed explanation. I think it was a course that I never felt wasted money on!! However, I think it would have been better if there had been an explanation of SEO, which is one of the main reasons for using NextJS. Thank you for the great course :) It was really helpful ~