To become a Lyft driver, you need to complete an application and go through a background check, but you can rent a car ...

I drive to learn, not to earn. But I really want to learn about what the driver experience is like and what the rider experience is like," Risher told Fortune.

You can use a Lyft promo code to get cheaper rides if you're a new user or refer friends to the service. Here's how to get, share, and use a code.