In American English, what is the exact difference between
- a student/teacher being on or in a course
and what is the difference between
- a class/exam/subject etc. being on or in a course?
I am a student in/on the Math course.
Are you one one of the teachers on/in this course?
Are there going to be online classes on/in this course?
I didn't learn a lot on/in this course.
What is going to be taught on/in Ms. Johnson's course?
Note: I want to know about the usage in American English because from what I see in previous topics on this on other forums, there is probably a difference between the usage in AE and BE in terms of on/in a course.