So, recently I've been getting somewhat interested into photography. I had a friend teach me some of the basics about iso, f-stop, and shutter speed. But sometimes you can't cover all of the topics in extreme detail and show amazing examples with them when you're showing them in person.
I recently stumbled upon this website: Fundamentals of Exposure
It really gives a good background into the basic settings of photography, and it even works as a great refresher and reminds you of a few things if you are already experienced at it.