A side hustle is a job or gig that you take on in addition to your primary occupation to earn extra money. The side hustle that makes money the fastest can vary greatly depending on your skills, interests, and the amount of time you can dedicate to it. However, certain endeavors have proven to be highly effective for those seeking quick returns. This article will focus on four popular side hustles: freelance writing, online tutoring, reselling items online, and ride-sharing or food delivery services.