I started by choosing one textbook and studied it alongside the lecture parts. If the lecture explanation wasn't clear, I looked at the book; if the book wasn't clear, I watched the lecture; and if neither worked, I studied through the internet or AI. It took me a long time to reach the end. On one hand, it's a bit bittersweet because, thanks to AI, you only need to know the basics of these grammar rules and details now, but for me, this lecture was truly like the Bible of C programming. Thank you for the great lecture.