Everything is good, but I think it would be better if the way you speak is improved a little when you lecture. It feels like you are presenting too stiffly, so in my personal opinion, it feels more like a college student watching a PPT and presenting in a set order like a robot rather than listening to a lecture, so I can't help but feel a little uncomfortable. Of course, as I chose 5 stars, the lecture content is really informative, and I feel it is really good for beginners. I think if you just improve the way you speak when you lecture, it would be so good that it would feel like a really perfect first-rate instructor.