Well, a supersport isn't a beginner's bike. Now that that point is out there I'll move on.
A tuck is used to reduce wind resistance, obviously. I use it on long trips to work, which can get exhausting on the straights and helps avoid the blow when passing a semi. If you're a poser (aka are out riding to look cool), don't do it; its often considered moronic; I'm old enough to not give a crap what others think. Proper form is taught at all the quality track organizations (any run by former AMA racers or Moto-GP'ers). There's not much to it. Push your rear back and get down on the tank.
Dragging knee is for the track, and dragging tail is for the lot. --Kane Friesen
When you're in a car, you're watching a movie; when you're on a bike, you're in the movie. --Robert Pirsig
Identity theft is not Fun