Holy cow. Those pictures look like they came from Mars. Love the last two with the macro lens.
I took some online courses which were pretty fun. Each week is a different lesson. White Balance, Aperture, Shutter speed, ISO. etc. We would get assignments to go shoot something in particular and then post it for the instructor and our classmates to comment on.
The best part about an online class, is that the students live all over the world. So you get to see their pics, which are pretty incredible since they are coming from all different areas.
Anyway, if you're looking for some insight into the separate functions and an opportunity for guidance, experience and feedback, I'd recommend it. Much easier than trying to figure it out yourself.