You can buy it with confidence. The advantages are as follows: 1. The overall build-up of the lecture content is good. 2. The voice is pleasant to listen to, so it is easy to concentrate. 3. It is very helpful because it includes a process of solving errors that often occur together. 4. In addition to the test content, there are many additional good contents such as common API response code returns and common exception handling. I only listened to half of it, but I will honestly write what I felt. If there is a chance, I would like to see you in other lectures. Please give advanced lectures~~