I am a graduate major, but I took Mr. Ttaebae's class because I regretted learning the C language and did not study C language diligently in my first year of college. If you are reading this review and are considering taking Mr. Ttaebae's class, don't regret it like me and take Mr. Ttaebae's class and get an A+! There were some things I already knew, but there were also a lot of new things I learned. It was more in-depth and friendly than what I learned in college. If I had to pick one thing that I remember the most, it would be the C language for loop initialization formula ( The role of the for loop initialization formula that I knew before taking Mr. Ttaebae's class 1) Can be omitted 2) Initialize a value 3) Multiple values can be initialized with , ) I didn't know that function calls were possible, but you told me about it, so I applied it to Java, the language I mainly use, and int i = 0; for (System.out.println("hello "), i = 0; i < 3; i++) { System.out.println("i = " + i); } I was able to confirm that the code above works properly. One of the characteristics of Professor Hong Jeong-mo's lectures is that If he tells me one thing, I want to apply it in a different way. It was a very valuable time because my overall programming knowledge expanded while listening to Mr. Tta-bae. Thank you for making such a great lecture. If I had listened to Mr. Tta-bae in advance when I was a freshman in college, it would have been easier to go to school..