I found a 30-minute introductory video about intersections.  It describes the history and definition of intersections in great detail.  Even though it’s a YouTube video, students are expected to respond because I should know what my learners can learn from the video and if they understand it correctly.  Since everyone has different backgrounds and experiences, they can understand different content after watching the video. Therefore, I hope they can post their thoughts and harvest on the forum (such as the forum on Bright Space) so that students can read and comment on each other to get more information.  The communication between students can promote their understanding of the content of the video. For example, different people may think from different angles and thus have a new idea. When he releases his new idea to his classmates, it means that the idea is obtained by more people.  If most people in the class have new ideas, students will be able to enrich each other’s ideas.  My suggestion is that they should exchange their ideas with each other on the forum so that they can develop their communication ability and the ability to extract information.  Through the forums, I was able to monitor their post whether each student was completing the task and how well they were doing.  I also comment on each student’s strengths and weaknesses in their posts.  This job may have some difficulties if there are many students.  But I think this job is a convenient way to manage students.  Tools like Bright Space help me know if a student has watched a video and commented on it.  I can tell from their posts whether they have a clear enough understanding of the video.  In addition, this approach facilitates the interaction between students and students and between students and tutors.  One disadvantage of the video is that it is a bit long, which can be a bit difficult for English language learners to understand.  Other impatient students are also likely not to watch it carefully.  Videos should be shorter and less academic so that students can quickly establish a connection between themselves and the content.