I started learning mainly about the big features, but I couldn't understand the small grammar, so I took this course. I was impatient because I wanted to make an app quickly, so I went through the process quickly, but it was actually poisonous. I think it would be better to start by learning the basic grammar. After listening to the course, I started to see things I hadn't seen before, and I was able to organize why I was using this kind of code! I sincerely thank you for providing such a great course for free. Thank you.