Here's two ways to learn but both have one thing in common - PRACTICE.
Use the scene mode on the camera. Look at what you've taken, note the settings the camera thought best to use. Change to manual and try to duplicate the shot or improve on it. Then practice what you've learnt.
The other is buy a guide book (sorry can't help with Canon) read a bit and go out and practice it, read a a bit more and have some more practice.
Derek - Nikon, Manfrotto, RRS, Apple *- PPOK -*