Hello, Alain Delon! This is the instructor :D First of all, I would like to sincerely thank you for taking the course <Next.js Master Class: Part 3 - Completing Real-World Architecture (Server-Client Synchronization, Extreme Optimization, Full-Stack Security)> and for leaving such a valuable and in-depth record. It seems you have followed through with trust from the previous parts all the way to Part 3! As you mentioned, Next.js server-client state synchronization, extreme optimization, and security are areas where the framework itself has a very high level of difficulty and complex concepts, making them difficult to cover lightly. Because I tried to include all the essential essences of a professional level, the pace of the lecture became somewhat long, but as an instructor, I am truly grateful and proud that you clearly understood the depth and necessity and learned well until the end. I strongly agree with your statement that "doing personal projects and being able to optimize better is how skills improve." It is truly wonderful to see you constantly learning and contemplating to expand your skills without becoming complacent, even while working in the industry. I sincerely hope that the extreme optimization principles and real-world architecture designs covered in this lecture will become a powerful weapon and a solid foundation for your personal projects as well as your future development career. Encouraged by your warm support, I will also repay you with better lectures in the future. I am grateful for the trust you have shown in your learning and would like to offer a small benefit. If there are any additional courses you wish to take among our curriculum, please feel free to contact us at the inquiry email jeony0535@naver.com. I will send you a discount coupon immediately after checking. Thank you once again for your precious time and sincere heart. I will always passionately support your continuous growth. Fighting! :D