I found this fantastic website created by the IAI! It allows you to take any of their courses online, free of charge, all you have to do is set up a free account!
Learn about mind-wracking concepts, such as: Constructor Theory, True Equality, Unveiling Reality, and so much more!
You also have the option to get a certificate noting your knowledge and passing of a course, this is obtained by paying a small fee and taking a test to prove that you have actually learned something from the course.
Good luck, and keep learning!