If you're not familiar with Udemy, you should be.
Udemy hosts tons of online classes (many for free) on a broad range of topics. You can "enroll" in classes, watch lectures and videos, read articles, and even take tests to further your knowledge in the area of your choice.
To get started, create an account with Udemy using your email address (preferably your school Gmail account.)
On the left side of the page there's a navigation panel. Select "Photography."