If you’ve got expertise in a certain area, package up your knowledge into an online course and sell it. This has become a very popular business model for online entrepreneurs over the past several years. The two big websites that are used to sell online courses are Udemy and Teachable. Check out this awesome article by Regina on How to Create an Online Course that Sells.

Affiliate marketing presents a very low friction entry into selling products online. While you do need some type of audience to sell these products or services to, you could make a significant amount of money from home while doing it. Some products or services have very high earnings per click. That means, if you play your cards right, you could easily make a large profit on conversions by driving traffic to specific offers as long as you target the right interests.
Launching a side business or figuring out how to invest your money when you’re strapped for time isn’t easy, but the payoff makes it all worthwhile. The money you earn from passive income will undoubtedly have you well on your way to achieving your financial goals and that much closer to true financial freedom. If you’re wondering how your finances currently stack up, find out where you stand financially. No matter the result, Turbo’s personalized advice will help get you where you want to be.
A website called AchieveMint gives you points for engaging in healthy activities, like exercise, tracking your eating habits, or even taking health related surveys. Points can be redeemed either for cash (10,000 points are worth $10) or for Amazon Gift Cards. The app actually connects with other health apps, like Fitbit and MyFitnessPal, to track your progress.
It’s something akin to picking stocks. You want to buy undervalued domains, and sell them later on at a higher price. For example, you can pick a domain that is out of favor, but could be related to some future event. So if you decide that the stock market is likely to crash in the future, you can buy a domain that includes the words stock market crash during a rising market, and then sell it in a falling market.
You can work as a virtual assistant through dedicated websites, such as Upwork or Zirtual. All kinds of skills are needed, and compensation can vary anywhere between $10 per hour to $100 or more. Obviously, the higher pay will be to people who have more technical skills, such as web building skills and marketing. But you can find work doing administrative tasks at the lower end of the pay scale.
If you have a spare bedroom, you can find a roommate or list the space on AirBnB for travelers. Having a roommate is the more passive of the two, as being an Airbnb host will require more work in the form of turning over the room between stays. This is a super painless way to earn $500 to $1,000 a month without much effort – you may even be able to cover your mortgage payment with this extra income!
22. Advertising – This is definitely the most old-school way of earning money with a blog. It’s also starting to become the least common way. You can sell advertising spots directly on your site or you can sign up with a company like Google AdSense or Media.net. Either way, you won’t see a whole lot of money from ads until your views are well into the thousands each day.
If you’re a fitness buff and have the right combination of charisma and business sense, working as a part-time online personal trainer can be both physically and financially rewarding. Once you build up a reputation and client base for yourself, it could easily turn into a full-time endeavor for you. Check out this interview with several fitness blog owners who are making a living online, from MonetizePros. As well, I'd recommend checking out this resource if you want to take this business idea seriously and get started with a business plan for your personal fitness trainer business today.

A large subset of our society is earning a full-time income by selling items on Craigslist and eBay. You can do this by selling your own items, or you can help sell items for other people and take a small commission. Selling on eBay offers more friction than Craigslist and you'll need to establish solid reviews before you can begin to move high-ticket items.
Are you an animal lover at heart? How about making some extra money just by taking a dog for a walk or boarding a cat for the weekend? You can advertise your own pet-sitting business on social media, put up signs throughout your neighborhood, or use a website like Rover. They let you set your schedule and adjust your fees as you see fit. If you do use Rover, keep in mind that they take a cut of what you make.(3)

Once you have decided what type of product you are going to sell, you need to decide where to sell them. Selling merchandise on Amazon or eBay aren’t your only options. Creating your own eCommerce store is another way to promote your products and generate sales. Once you have decided what you are going to sell, whether it is white labeled products, your own designs, or other people’s merchandise, you can set up an eCommerce website to display these products.
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. 
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