Knowing whether your are Goofy or Regular simply means finding out which foot to put forwards on the snowboard: left foot or right foot, and which way you face on your snowboard.
- Regulars put their left foot forwards.
- Goofies put their right foot forwards.
This stage is crucial as it defines which is your front foot and all the techniques and turns will be adapted to that.
A Regular isn't necessarily left handed and a Goofy right handed.
Indeed, 75% of snowboarders ride Regular (which is why they are known as "Regular").