Mechanical Turk: You’ve probably heard of Amazon’s program. If not, here’s the simple version: You pick tasks to complete—“anything from conducting simple data validation and research to more subjective tasks like survey participation, content moderation, and more,” describes Amazon—and get paid for your efforts. Since you’re going to see a lot of lowball offers on the site, I recommend using the unofficial /r/mturk subreddit to help you hunt for juicier opportunities.
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!