Since you stand sideways on a skateboard, you have to decide which foot will be your front foot. However, the best thing is to leave that decision to your gut. Once you step on the board, go with what feels right. After all, you didn't consciously choose to be left or right-handed, did you?
The stance where the left foot is the front foot is called regular (> Fig. 01). If you stand on the board with your right foot as your front foot, the stance is called goofy (> Fig. 02). Fakie is when you perform a trick, e.g. an Ollie with your »normal« stance while rolling in the opposite direction. The term switch describes a goofy-rider performing his tricks in regular stance or vice versa.
Frontside (Fs) und Backside (Bs)
Aside from stance, tricks are divided into two more categories: frontside (FS) and backside (BS). When you turn into a flattrick with your back facing in the direction of travel, it's called »backside«, and when you turn with your front facing the direction of travel, it's called »frontside«. The same goes for shove-its. With ledge, rail, and lip tricks, it is a little different. It always depends whether the obstacle is in front of your chest (frontside) or behind your back (backside).