I was looking for a lecture that would be better to study using a book or to study while listening to a lecture, and I found Hong Jeong-mo's C language lecture on Inflearn, which one would be better to follow, and I took it because there were many reviews saying that it explained the basics of programming languages and how computers work and how data is managed in an easy-to-understand way. I was a little worried because I sometimes saw reviews saying that it might be difficult if you don't know anything, but after taking the lectures from the beginning, I think that if you have a firm determination to study, it would be better to just take the lectures and study without worry. Above all, pointers are the most difficult in programming languages, and many people give up because they get stuck here. I know a lot, but before learning pointers, he occasionally mentions pointers and says that if you understand the part you are learning now to some extent, it will be easier to understand when you come across pointers later, and he reminds you every time you analyze the code so that you don't forget what you learned. The lectures are long because he covers a lot of content thoroughly, but that makes it more certain. I was able to study grammar and concepts. If I had to say a shortcoming, it would be that among the C language (Ttabae) lectures that I study from the perspective of knowing nothing, it can be difficult to distinguish between the important lectures and the lectures that you don't need to know and can look up later if you don't know them. I'm also going to study data structures and take Ttabae++. I recommend it to those who want to study what the C language is from the beginning and those who want to clearly organize what the C language is.