I took the two introductory courses at SAIT (4-5 years ago), but I was an absolute beginner, and even then, the only real value I got was the critiques of the pictures.
If you want courses, and want to have the opportunity to ask questions and receive critiques on pictures, you might want to look at
PPSOP courses - they are on-line and you get email feedback on your pictures and you get opportunity to ask questions to the instructors and other participants - they are a bit pricey though. I took the introductory flash photography course and it was very good - it gave me a good overview of how to use speedlights (even though I still s**k at using speedlights).
Or you can just pick up the book "Understanding Exposures" by Bryan Peterson (he's the founder of PPSOP), which does a really good job of explaining exposures.
Good luck...