Hi, Xiaohai, thanks for sharing your blog, after reading your blog, I found watching videos to learn new knowledge is also a very effective way to learn. For example, in the video you shared, we can follow the video to learn how to take photos more easily, and we can compare the photos after taking them to find our own problems first. After taking photos to compare the first time to find their own problems, and then according to the instructional video to adjust themselves. At the same time, we also have the opportunity to communicate and share with others in Zoom and other software, which also gives us more freedom to discuss and feedback space, learners can give each other comments in the online feedback, discuss and learn from each other, which is a very good interactive way to learn.