A side hustle can be as small as a few hours a week driving for Uber, or as big as the creation of a new product that scales into your main source of income.­ The key to success is to understand your motivations, your strengths, and where you want to see it go­. If self-determination is your passion, your side hustle, then you need this issue of SUCCESS magazine. Inside you'll find the ultimate guide to a solo-on-the-side pursuit, profiles of people like you, achievers who never settle, and our first-ever 30-under-30 list. Plus, be sure to check out feature stories on perseverance, positivity, imagination and productivity.