Thank you, Wanje Cho! I sincerely appreciate you leaving such a great course rating! 🙏 The feedback you've shared is a tremendous source of encouragement. If you'd like to gain a deeper understanding of Express.js and systematically learn the fundamental principles of server development, I highly recommend the "Building a Node.js Server Engine – Learning Framework Design through Express.js Clone" course. This course goes beyond simple usage and is structured to help you naturally master the core concepts of server engine design by directly implementing the internal workings of Express.js. Through the process of experiencing the structure and philosophy of frameworks firsthand, I'm confident you'll find answers to fundamental questions like "Why was it designed this way?" going beyond mere technical learning. I also want to express my gratitude and continuous support. 🙇‍♂️ Whenever you have questions or need help with development, please feel free to use the open chat room below. You can communicate with fellow learners, and I also drop by frequently to share thoughts and concerns together! 📮 Open Chat Room: [https://open.kakao.com/o/gC10Fnoh] I wholeheartedly support your development journey. I hope to see you again in the next course! 🚀