Why is the best content to display on a sticky nav with a learning site?

So far, I have a sticky nav with a button to purchase the course, the price of the course and a Wish List button. These elements are very important for revenue purposes. However, I'm not sure what else I should put on the sticky nav that helps use space, but also doesn't seem not important enough to be in the users face 24/7. Right now, I have the ratings of the course. Is this smart? Do users want to be reminded of the ratings? What if the ratings suck? What should be in this sticky nav?

EDIT @Andrew Martin

I just realized I'm misusing terms. A sticky nav is a nav that gets smaller, not created on scroll. This is a nav that is created, not shortened. I actually have a total of three navigations, but only one is fixed. The first one will contain my logo, search bar and user details. The second nav contains info on different course categories:

The below image shows the sticky nav and the other elements of the surrounding webpage.