Hello YU NA Joe! 😊 Thank you so much for leaving such a valuable review. 🙏 I'm truly delighted to hear that the DevTools utilization techniques and analysis processes covered in [DOM Complete Mastery Part 3] were helpful to you. I believe that the ability to directly observe browser performance and trace the root causes, rather than just stopping at theory, is the most essential skill needed in real-world work. It means a lot to me as a creator that you recognized both the enjoyment and usefulness of this approach. Given your interest in principles and analysis, I think you'll be able to develop great insight into how React internally optimizes rendering through the currently released [Learn React Properly Part 1] or the upcoming [React Part 2]. If you have any questions while studying, please feel free to ask anytime. 💬 I'll continue to deliver in-depth content that you can apply directly to your work. Have a great day! 🌿 We're also communicating with students in an open chat room, so please drop by when you have time. 👉 https://open.kakao.com/o/gC10Fnoh