There aren't many front-end TDD classes. I tend to listen to Kim Jeong-hwan's lectures as much as possible. When I became interested in test-driven development, I bought the lecture and listened to it all. I think it will be a helpful lecture for beginners because it explains things easily. It's a bit short, so it's hard to understand the in-depth content, but I think it's a good lecture to start with. Thank you for always giving great lectures.