The following are some videos that provide open classes for famous schools at home and abroad: 1. Coursera (.coursera.org/): provides videos of open classes from many universities around the world, covering various disciplines. 2.edX(.edx.org/): an online education platform jointly founded by Harvard University and Massachusetts Institute of Technology, which provides many courses. 3. khanacademy (.khanacademy.org/): provide educational videos including mathematics, science, history and other disciplines. 4.TED(.TED./): A well-known public speaking platform, where many university professors and scholars share the contents of open classes. 5. MIT Open Courseware (ocw.mit.edu/index.htm): MIT offers a large number of open courses covering various disciplines. 6. Harvard University YouTube Channel (.YouTube./user/Harvard): The official YouTube channel of Harvard University contains a large number of open class videos. 7. University of California, Berkeley YouTube channel (.YouTube./user/UC Berkeley): The official YouTube channel of University of California, Berkeley, provides open class videos and academic lectures. The above are often recommended, and you can choose according to your own interests and needs. In addition, there are many open class videos provided by other universities and institutions, which you can explore further through search engines.