This person is a true educator. It was a lecture worth 50,000 won, but I received several times that amount. I was really grateful for the quick Q&A. In the JavaScript part that you should know in the previous section, I had a question because I had difficulty understanding asynchronous functions, and after answering in detail, the instructor released his secrets on YouTube for free. Here is the link. https://youtu.be/A7AeQzEoEmc (In particular, the secret to convert promise then to async await 1:1 is amazing. Until then, I couldn't find that method even by Googling. It seems to be the research result of Mr. Zerocho. Even if this secret becomes common over time and is shown on many blogs and YouTube channels, I hope that it is remembered that it is a secret that Mr. Zerocho released.) I thought that he was a very generous person who released the secrets that he had researched and created for years for free on the Internet. You have to be very generous when it comes to things like sharing class notes, and the students who share are very generous. I can feel it, This is a free sharing of competitiveness related to livelihood as an instructor Just as a person, as an educator, you are cool I haven't finished listening to the lecture yet, so I will listen to it all and edit the course review