I'm still taking the class, but the instructor explains everything really well, and when the video gets too long, it gets loose, so he breaks it up well. As a side note, his voice doesn't make you sleepy, so I don't fall asleep and I listen to the lecture well. ㅎㅎ It's my first time learning about the backend part, but John An, I think I did well in listening to the lecture. I think I'll have to listen to it several times for it to become mine. ㅎㅎ After listening to this, I'm planning to pay for the shopping cart part and listen to it!! Thank you for such a high-quality lecture.