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'classes on' is correct and usable in written English.
You can use it when you are referring to a series of classes or classes that are held on a particular day or topic. For example: "I'm taking classes on German language every Saturday morning."
Exact(57)
So maybe have all morning classes on one shelf, and afternoon classes on another.
Dance classes on campus.
Classes on wine investing are taking off.
It has classes on Saturday too.
But there were regular classes on it.
Lecture classes, on the other hand, are prerecorded.
Now I go to classes on my own leisure.
(The botanical garden offers classes on how to do it).
They ordered training classes on racial sensitivity for employees.
Georgetown University started auctioning classes on eBay last fall.
There were no Honors classes on his timetable.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com