Energy is not something you learn, it is something you feel. Do not try to analyze it. Instead, open your heart and accept the energy. There is no right or wrong way to feel it. Energy is a little like water. You cannot see or touch the buoyancy of water just by looking at a pool of water, yet you can see that fish swim and boats float. Only when you actually jump into the water can you really feel the existence of buoyancy. Energy is similar in that you cannot fully understand it with your eyes, rather it is something you must experience and feel throughout your body.
Begin your energy training with Jigam meditation in your regular Dahn Yoga class where you can try feeling the energy with your hands.