First of all, I followed Gi-seon and kept looking for references, and I developed a good habit of becoming familiar with references. The lecture style itself is definitely a lecture that some people will like or dislike. I don't mean it's bad. However, there will be a small number of people who are not familiar with the idle tool but use shortcuts and do it quickly, but some people will still have to Google it. You may say that you need to develop this habit of Googling, but... I think that experiencing it through this lecture may not be beneficial. The flow of the lecture is a bit interrupted... I think that some consideration from the perspective of the students is needed. Of course, the lecture itself is targeted at intermediate level students, but it would be okay if it was a little more student-friendly. I don't mean that "the lecture style is bad" or "the content is poor". From the perspective of a person who purchased the service, even these minor aspects can be dissatisfactory. The lectures are presented in an easy-to-understand manner based on documents, and I think it would be more fun and better if students took the initiative by finding references themselves rather than clicking on links in the textbook.