The lecture was easy to understand and practice-oriented, which was good, but the difficulty was lower than expected, which was disappointing. More advanced content would have been better.

It seems like a lecture that can be put to practical use immediately.

It seems like a lecture that makes you think twice before writing a query. Thank you.

I think it's really great that you explained in an easy-to-understand way how to optimize the index search. The only thing I'm disappointed about is that the course duration is 12 months 😭,😭 I wish you could let me take the course for life even if I have to pay more. :)

I read the book well, so I bought the lecture. Thank you for making a good book. I am watching the lecture.