Origin and Myth of Goofy Foot
The most common assumption is that most boardsport participants rode with their left foot forward. Hence, 'regular' became the stance of choice. Nowadays, it is believed that the split is even between goofy and regular riders.
Does it matter if you ride regular or goofy?
Regular is when your left foot is at the front. Goofy is when your right foot is at the front. Sometimes people can push mongo, which is when they use the foot at the front to push off. This is usually looked down on in skate culture, but it really doesn't matter at the end of the day, as long as you're having fun.
Why are some people Goofy vs Regular?
Genetics of Handedness
Why some of us are born left-handed, right-handed, or goofy-footed is thought to relate to an important and early time in the formation of our brain.