The load is where you gather and store energy that will be released into the baseball.
The movements of the load are not huge movements. In fact, most people load with very slight movements. You will lift your front heel and turn your front knee in just a bit. Your front shoulder will close slightly, moving the hands back. The head of the bat will tilt toward the pitcher and the knob of the bat will be pointed toward the catcher.
The power will come from the ground up. Your weight will transfer to roughly 60%/40% in favor of the backside. This is where the “coil” begins before the assault on the baseball.
Look at the initial load by Bryce Harper. In the first picture, he is in his comfortable batting stance with his head and eyes locked in. In the second picture, he begins to load while keeping his head in the same spot.