I learned on bicycles, friends' mini-bikes, mopeds, ATVs, scooters, and the occasional dirtbike. I then got my first streetbike and took the very basic DMV test to get a license when I got out of vocational school in the Marines. I rode many different streetbikes for several years, then hung it up for a decade. When I got an old streetbike again, my GF decided she wanted to ride too, so we enrolled her in a BRC and I decided to join her. I'm still learning things, several years later.
Some are guard dogs of the flock. Some herders, search/rescue, or companions. We Devildogs are those, and also retrievers. Hell is our blazing dogpark, our frigid swimming hole. The fallen are our tennis balls. We don't leave the fallen behind, even if the master has to bring them home for us. Semper Fi, my friends.