ProPhotoLife by Jim Talkington is a great blog to visit. What I find is really great is the videos that teaches you from a DIY studio set up, to understanding different forms of lighting, and techniques in lighting. Nothing beats learning how to light than by seeing the positioning of the lighting equipment, and the results from the pictures taken.
To go to the ProPhotoLife video library, click here, or go to the YouTube one here. Below is Episode 12 on Quality of Light.