As per the previous point, often the logistics of growth makes a method unappealing to me, however I do want the income streams I go after to have the potential to scale, and scale big. This means if you do discover something that makes you money, the possibility to grow it to a life changing amount of money is a reality, and you understand how this can happen.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
And while it will take time to build up a big-enough audience to attract advertisers and other ways to make extra income from your podcast, the opportunity is there. John Lee Dumas interviews entrepreneurs seven days a week for his podcast Entrepreneur on Fire and now makes more than $200,000 a month from it. In fact, John publishes all his income online and showed that he’s made almost $13 million since launching in 2012.
If you’ve ever wanted to try real estate investing but don’t want to deal with all the stress of being a landlord, you might want to consider investing with Fundrise. Fundrise is a new platform that allows you to invest directly in a real estate portfolio that a team of professionals identifies, acquires, and manages on your behalf. With a starting investment as small as $500, you get exposure to dozens of solid, value-producing assets.
Anything from Amember to Quickbooks is fair game here. In the hosting industry, iDevAffiliate and Plesk Billing were the pieces of software we would have paid a lot of money to have someone else deal with. The more niche and more complex/annoying/frustrating the software, the better! Even if the software company offers free installation, you can make hundreds or thousands of dollars training business owners or their employees on its usage. Focus on one piece of software and become the trusted expert. Create videos and tutorials using screencast software like Camtasia to increase your profitability; this may also lead into a niche product that you can sell. (Amember offers “free installation”, but it took my boyfriend and I over 10 hours to configure it properly. That’s definitely something I would outsource next time!)
Work remotely for a call center. Because many call center jobs are location independent, finding work in this field is an easy way to earn some money from home. Dozens of sites list job openings for call-center representatives, including Freelancer.com and SimplyHired.com. Meanwhile, you should check local job listings for openings and opportunities as well.
Teaching and tutoring English as a second language is a great way to make money online, not to mention open some doors for you to travel the world if you'd like. While full ESL (English as a Second Language) accreditation is recommended, as long as you’re a native speaker and have the ability to teach, there are people in countries such as Hong Kong or the UAE who are willing to pay upwards of $25/hr for you to tutor them English via Skype. Check out Indeed, Learn4Good and Remote.co for remote english tutoring jobs or sign up on a specialized site like VerbalPlanet or Chegg Tutors.
Normally you’ll be asked to test a few websites by visiting them and to document and record your reactions and thoughts as you go through it. It’s really easy to get set up making extra money online by testing websites. All you need to do is sign up to the following services: UserTesting.com, Userlytics, TryMyUI, Userfeel, TestingTime (UK only), or Side Income Jobs.
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!