On the way, he meets a young girl named Bulma Briefs, who happens to be the daughter of the president of Capsule Corporation. It's from here where she gets all of her capsules. A capsule is exactly what it sounds like. She picks one, throws it on the ground, and it turns into the vehicle of her choice. Ones like an airplane, a hovercraft and a speedboat.
Motorcycles are common too.
Goku meets Bulma as she is on the search for the mystical DragonBalls. Legend said, they were seven magical balls that granted the collecter any one wish they desired if they gathered all seven into one spot. Goku himself was taught by his grandfather Gohan. Gohan was a master of the Martial Arts. He taught Goku everything he knew.