Basically you have 4 main ingredients. You, your smoker, your food, your ingredients.
Here's the best way to learn.... Start cooking stuff. (Chicken is always good, as it's inexpensive). Take notes about what was good & what wasn't, how you prepared it, how you cooked it. After that, do it again on your next cook, but change one variable based on your previous cook.
Any course will give you the basic techniques, but in the end you need to learn to cook the food with the equipment that you have, and how it works.