It’s not very engaging, or mentally stimulating, but taking online surveys through companies like Survey Junkie do pay out (a little), believe it or not. Even if the payouts come in the form of Amazon gift cards, sites like Swagbucks can pay well. Just don't expect to make bank with this side business idea—I recommend combining it with another source of side income from this list of my best business ideas, and turning to surveys in your downtime when you need a little extra income.
If you’re serious about making money selling things online, it’s pretty much impossible to not recommend Shopify. The platform gives you everything you need to get your online store up and running in less than a day including a custom domain, beautiful templates (so you don’t need design skills), secure payment options, and they can even take care of marketing and shipping for you. Whether you’re promoting your own products, designs, or curating other products for people in your niche, Shopify is the best option for powering your online store.
What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!