Your dominant foot is going to play more notes over a lifetime than either of your hands. It deserves the same technical attention that grip and stroke get on the snare. There are two basic foot positions and two basic stroke types, and most of what a working drummer does is some combination of the four.
The two positions are heel-down (the entire foot rests on the pedal board, the leg is relaxed, the ankle does the work) and heel-up (the heel lifts off the board, the leg drives the stroke from the hip and thigh). Heel-down is for soft, controlled playing — quiet ballads, jazz comping, anywhere the kick should be felt rather than heard. Heel-up is for everything else: rock, funk, pop, anything loud or fast. Most drummers settle into heel-up as their default and bring heel-down out for specific situations.
The two stroke types are the buried beater (the beater strikes the head and stays pressed against it, choking the resonance) and the rebound (the beater strikes and bounces back off the head, letting it ring). Buried-beater gives you a thick, articulate thud — perfect for rock and metal where a clipped kick cuts through. Rebound gives you a longer, fuller boom and also makes fast playing physically possible: you can't bury every stroke at 16th-notes. The choice is style-dependent and tempo-dependent, and once you have both, you mix them constantly.