Owning property can earn you passive income for decades to come. Once you purchase a duplex, home, or apartment building as a rental property, you’ll earn a consistent monthly income with little work. Rent should cover your mortgage, taxes, repairs, and other expenses. You’ll continue to earn income by paying off your mortgage with the rent money and saving excess rental income.
To begin with you can tie up with ad consolidators such as Google Adsense, Bing, and Yahoo. These companies run the advertisements on behalf of their clients on your website and pay per click or per 1000 views. These advertisements can be interest based according to the genre of your blog to attract customers of a particular geographical region, gender, age and individual interests and tastes.
Affiliate marketing is a great way to earn passive income. You can find products to share via your social media platforms, website, or through an email blast. Once somebody purchases a product, you are given a 20-70% commission. I like to use Clickbank and find affiliates that correspond with my meditation brand. You can also seek affiliates out directly such as Hay House which offers a 50% commission on any courses sold.
The easiest way to make truly passive income is to invest your money into a stock, ETF, mutual funds, etc. The richest people tend to get even richer because they consistently invest and reinvest their money. Keep it up, and you might even be able to never have to work again. I know one guy whose investments now earn roughly $50,000 a year in dividends, and so he is free to live without working if he so chooses.
When I purchase an existing online business, I look for cash flow over the past year and where the money comes from. I want the sources to be more passive so that it does not take a lot of my time. Also, typically I will make an offer that is 18 – 24 months of profit so that I know that I will get my money back within the next two years. I hope that helps!

Your images will have a huge impact on how well your social media posts do. This will differ among the different platforms too. I always create a Pinterest image for my blog posts here. They’re consistent to the brand, allowing people to know it’s me the minute a new pin pops up. Verticle pins are better than horizontal in most cases (I find TV shows can be an exception to the rule).
Many people in the investment world also define residual income as revenue stemming from a passive source. This revenue is created without a direct input of effort or time. The investment itself creates addition revenues without having to be managed. Some examples include royalties, dividends, interest, and rent. Take a dividend stock for example. Once the money is invested once, it will keep producing a dividend every year without having to input additional time or resources. This concept is the Holy Grail for most investors.

You may not think of driving for Uber as a “passive” income strategy, and in many cases, it’s not. What you may not know, however, is that Uber has a feature called “Going my Way” that allows drivers to specify where they are headed and pick up passengers along the way. So why not sign up as an Uber driver and start getting paid for driving where you were already headed anyway?

Wow! What an awesome list! My favorite is the stock photography because I love photography. I have had some success there, particularly with one photo I make some decent income from. I think the key with stock photography is finding a shot that is high demand. Then, find a new unique way to frame that shot. This is the reason my St. Louis Arch photo is a top 10 on both ShutterStock and iStockPhoto. Thanks for the awesome ideas above!
Build a list in a particular niche and tell them stories. Create a bond. Build a relationship with them. It's important. Then, when you've created a bit of culture, start marketing affiliate products or services to them that you think they might like. Just be sure that you personally vet out whatever it is that you're selling to avoid complaints if the product or service falls short.
If you're looking to get started in real estate, look at a crowd funding solution like RealtyMogul. It works similar to LendingClub - you commit as little as $5,000 towards a property. When the property is fully funded, you become an owner, and will receive your share of the earnings and appreciation in the property.  Check out RealtyMogul to learn more.