Oh, you understand the code quality. You are a good person. In fact, there are many websites that explain related functions with various codes. However, when I searched, they all had various additional functions and grammars attached to the functions that I had to learn in the code, so it was difficult to understand and utilize the functions. So, all the codes in my lectures were organized to make the functions easy to understand, while also being as standard as possible, even down to the method of naming variables. So! If you listen to the explanations along with the lectures, whenever you need the function, you can immediately understand the function and utilize the code by just looking at the materials. Thank you for your good review.