Evaluate Web sites. Another way to make extra cash in a short amount time – $10 for about 20 minutes of work – is to sign on with UserTesting and evaluate Web sites. You need a computer with a microphone and Internet connection, and you’ll have to fill out a one-page demographic profile. You’ll receive work if your profile matches that of the target audience of sites being tested. Then it’s just a matter of using UserTesting’s screen recorder, which you'll need to download to your computer, to record your verbal comments and on-screen movements as you click through a site. Site owners typically are looking for feedback about whether the Web site is confusing to navigate.
Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
As I mentioned in a previous post on the 3 Types of Affiliate Marketing Explained, the way I earn money with affiliate links in ALL of my online businesses is by promoting only products that I have used, and only what I would recommend to my friends who want to achieve similar results. I feel that anyone with an audience has a responsibility to do the same thing.
One of the easiest ways to get exposure to dividend stocks is to buy ETFs like DVY, VYM, and NOBL or index funds. You can also pay an algorithmic advisor like Wealthfront to automatically invest your money for you at a low fee. In the long run, it is very hard to outperform any index, therefore, the key is to pay the lowest fees possible while being invested in the market. Wealthfront charges $0 in fees for the first $15,000 and only 0.25% for any money over $10,000. Invest your idle money cheaply, instead of letting it lose purchasing power due to inflation. The key is to invest regularly.
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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!