course
A course is a series of lessons or lectures on a particular subject. It usually includes reading and written work that a student has to do. You say that someone takes a course or does a course in a subject.
The department also offers a course in Opera Studies.
She took a course in Latin.
Be careful
Don't say that someone takes a course ‘of’ a subject.
Don't say that someone takes a course ‘of’ a subject.
In British English, the people who are taking a course are referred to as the people on the course.
There were about 200 people on the course.
In American English, they are also referred to as the people in the course.
How many are there in the course as a whole?