I liked the lecture style where they explained only the core parts first, gave a set of problems, and then proceeded with the solution :) However, I thought the intermediate solution lecture would be at least HackerRank Medium, so I rushed to pay for it, but I was disappointed because there were fewer medium problems than I thoughtㅠ I think those who took database classes in college can take the lectures after intermediate. I have to go pay for the advanced problem solving😊