I accidentally changed the information on the teaching page. How can I go back?
Whether I take another course and come back again Or re-enter It is still the same.
You can go back by using the “Undo” keyboard shortcut, for example Ctrl + Z on Windows and Command-Z on Mac.
If this does not work, the ultimate workaround is that you close your browser and come back in 20 or more minutes. By that time, you will get a new VM with a brand new notebook.
If you have already left for some time, the note will be correct by the time you resume.
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Thank you very much. 
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