Michelle
Kind of tiny on my screen but it looks to be OK with the exception that I'm not seeing a junction between the Student and the course.  Take a look at the Event Enrollment video.

Your course is the basically the Event.  This shows how to set up the relationships.  It also allows for max enrollment and payments.  I think this will really get you down the road.

Looks like the middle table is a junction table. Only thing I see really that I would change is making field names with the # symbol. You're at best going to have to put brackets around those fields when you refer to them later in code, at worst they could become a major headache. I would change all the # signs to Num or Number, NumCertificates for example.

The way it's setup now looks like it would only allow one payment into each course. If someone made a split payment or multiple payments you wouldn't be able to track that from what I see here. If that's a problem you'd want to setup another table for payments.

Good catch Adam.  # definitely an issue.  As I said - tiny screen.
Michelle - the video I pointed you to above will show how to take payments in the extended cut.

I'm just a beginner here, and may need an explanation as to what I see:  (1) why is "CourseDetailsID" in the StudentsT?  I don't think it's necessary.  (2)  Why is "StudentID" in the CourseDetailsT?  Again I don't think it's necessary.  The many-to-many relationships will "happen" with the Students_CourseDetailsT, would it not?

Again, I'm just learning and want to learn more.  Hope I have not caused any unnecessary confusion.

Good catch Paul, you do not need them in the single tables. Unless it was something like you wanted to store a "homeroom" class for the students with the courseID or a "favorite student" in the courses with the studentID haha. These would be a one to one relationship so they don't do anything for the many to many relationship.

Thank you all for the good tips.