I have seen many backend lectures, but this is the first time I have seen such a clean lecture. There are chapters that provide information in the middle, and the parts that explain the contents in a way that beginners can easily understand and move on were impressive. In particular, I learned the concept of OOP, but I was curious about how to utilize it well, and in this lecture, it was even more fun to see the code that can be converted into various formats through the abstraction stage. The generics provided by TypeScript are simply specifying types, but you can flexibly select types, and it was great to be able to experience this in the pagination generalization chapter. And what was really surprising was that even when refactoring code like this, it was amazing that the learner could write it without getting confused. In a situation where there was no senior backend in the company, I changed the stack to JS and learned Nest, and the lecture that Coding Factory made with care was very helpful for my career and seems to have laid a good foundation for the future. Please give me a better lecture, and I will buy it right away from the next lecture without even thinking about it. ㅎ + Although it is called a beginner's lecture, there are many in-depth contents for a beginner's lecture. There is a lot of abstraction to increase reusability, so those who are studying backend for the first time may find the latter lectures a bit difficult.