I am writing a review of the course with only the lectures left to verify through practice. Pros: The lectures are good. The explanations are easy to understand, so the content of the course is easy to understand. Cons: The materials are insufficient compared to the price of the course, and the lecture volume keeps changing from the middle part. This course consists of 56 lectures in 704 minutes and costs 38,500 won. The lectures are good, but the materials are insufficient. The lecture materials, PPT, are also very poor, and there are almost no examples in the PPT, and only a few are shown in class. Despite the course costing close to 40,000 won, I think there are too few materials. Also, the volume is constant in the beginning, but from the middle part of the course, there are lectures with low volume and lectures with high volume. It is not a small price, but I think that part is a bit too much. Assuming that you do not have a book and only listen to the lectures, I would not recommend it because there is not enough materials compared to the price. However, if you have a book about it and you say that it doesn't matter as long as the lectures are good, it would be okay. I give this course 3 stars because it is included in the first element and the lecture sound is not consistent compared to the price.