Well, I haven't listened to many lectures yet, but what I've felt so far is that it's hard to understand design patterns at once by writing them through lectures. I think I understand it when I organize it again on my blog and say, "Ah!" Of course, it may be just me, but I still think that lectures with excellent examples and explanations and organizing them myself to make them my own have enough merit, and I would like to thank Zerocho for creating such a good lecture.