It was nice to hear the instructor's various opinions from a practical perspective that are not in the refactoring book. Honestly, I think the book alone is not enough. It's because you need a practical situation to refactor. Even while listening to the lecture, you can simulate situations through various explanations, so it was good because my curiosity from a practical perspective was somewhat resolved. And the last book you recommended was a book that I had bought in the past and put on the bookshelf because it was difficult, but I was relieved that I didn't get rid of it because you mentioned it in the lecture. Thank you for the great lecture.