The switch stance ollie uses a similar body motion, but the nollie is subtly distinct: For one, the rider is always moving forward, with the body positioned in a nollie stance--closer to the nose and with the front foot on the nose. Secondly the rider usually postures the body differently so as to compensate for this stance with respect to the forward motion. The rider presses the nose down using their front foot to engage the "pop" motion in order for the board to rise. This is In contrast to a "Fakie Ollie" where the pop motion is performed by the rear foot on the tail, similarly to a normal Ollie, however the rider is traveling backwards when performing a Fakie Ollie. Where in a Nollie the rider is traveling forward with their front foot on the nose to apply the initial force "pop".
Shock pads are made of polyurethane and rubber. They are very similar to risers but vary in the fact that their sole purpose is to cushion the board from the trucks. Since the trucks are metal and the board wood, whenever the board hits the ground after doing a trick, the energy goes through the truck to the board ─ this has caused boards to crack, split, or even break in half, and shock pads were created to prevent this.
Large power is created at the point of action by applying small power to the point of effort. Application of this concept to skateboarding makes the back wheels the fulcrum, the tail the point of effort, and the nose the point of action. Applying power to the tail causes the nose to shoot upwards. When the front foot of the skater levels the nose at a point roughly horizontal to the ground in anticipation of the tail, soon to be leveled likewise by the skater’s back foot, the process smoothly done creates the illusion of the skateboard ‘sticking’ to the feet.
Finally, just roll away. If this sounds simple, then great – get out there and practice! If this sounds too complicated, don’t worry. Just go slow, and take your time. There is no time limit to learn how to ollie – some people learn in a day, and I know one guy that took over a year to learn how to ollie on his skateboard. Also, like with most things in skateboarding, your body is learning how to ollie more than your mind is. So, with practice, you’ll eventually get it.