I am very grateful for the free upload of such good technical materials. I saw on the instructor's homepage that there was a coffee sponsorship, so I will definitely send you one. I hope you will continue to provide good lectures. The reason why it is not 5 stars is because the code itself is very good, but it is a bit of a follow-up lecture, so if you include detailed explanations in the future, it will be a really good lecture. I look forward to it and support you^^