Free is great isn't it? 

Harvard is offering free photography courses! There's 12 main modules, and the last one is an evaluation of what you learned. 

There's also retouching education thrown in the mix as well. I may sign up just to check it out! 

1. Module 1: Introduction to Digital Photography     Start Module     0 / 5
2. Module 2: Introduction to Software     Start Module     0 / 3
3. Module 3: Introduction to Light     Start Module     0 / 2
4. Module 4: Introduction to Exposure - Part 1     Start Module     0 / 4
5. Module 5: Introduction to Exposure - Part 2     Start Module     0 / 4
6. Module 6: Introduction to Optics     Start Module     0 / 5
7. Module 7: Introduction to Histograms     Start Module     0 / 4
8. Module 8: Introduction to Software Tools     Start Module     0 / 4
9. Module 9: Introduction to Digital Cameras     Start Module     0 / 4
10. Module 10: Introduction to Digital Cameras - Part 2     Start Module     0 / 4
11. Module 11: Introduction to Color     Start Module     0 / 4
12. Module 12: Introduction to Artifacts     Start Module     0 / 3

To access the course: 

https://alison.com/courses/Digital-Photography/content/scorm/6328/module-1-introduction-to-digital-photography

You will need to sign up, but after that, it's all yours. 

MIT Courses

MIT also offers a dozen free photography courses as well. They are both graduate and undergraduate level courses. 

If any of these courses interest you, you can check them out here: 

https://ocw.mit.edu/courses/find-by-topic/#cat=finearts&subcat=visualarts&spec=photography