As a computer science student, I was struggling to choose a specific field. I received a lot of help from your videos while studying operating systems, and recently, I got a lot of help again. I took all the C language series and felt the fun of C/C++, and when I looked at the roadmap, I found something called system programming..! I paid for all the lectures on the roadmap and watched the system programming videos, and I thought, "This is it...!" In the end, I fell in love with the charm of system programming, and I bought Jeffrey Richter's book and am studying hard. The book I briefly looked at before watching the video was really difficult. But in line with the reason why you created this lecture, I started to understand the book as I watched the lecture :) Thank you so much for making such a great lecture available at this price, anytime, anywhere..! I will study hard and grow so that I can meet you in person and say hello!