Dividend investing is right up there for sure. You don’t have to charge $48. You can charge <$10 to boost sales. The internet has enabled so many creatives to publish their works at a low cost. People will surprise themselves if they try to create like when they were in school. The other reason why I have Creating Products edging out dividends is because of the much higher POTENTIAL to make a lot more money. For example, $20,000 a year in book sales requires $570,000 in dividend investments to replicate the same amount. Plus, there is capital risk. With book sales, there is a correlation with EFFORT, and you are not beholden to the whims of the markets.
“There is no such thing as 100% passive income,” says Flynn. “Even with real estate you still have to manage your properties, or even with the stock market, which is potentially passive income, you still have to manage your portfolio. With online business, there is no such thing as 100% passive income — and this is coming from a guy with a blog called SmartPassiveIncome.com. The definition of passive income is ‘building these businesses of automation,’ but in order to keep them automated and keep that trust going with your audience on top of that, you do have to keep it up every once in a while — so a lot of time upfront and a little time after. But there is alway time involved.”
Most credit card companies offer sign-up bonuses to entice you to open a credit account with them. As long as you don’t spend money just to hit the minimum balance and always pay your balance on time, this can have a minimal impact on your credit score while earning you hundreds – or even thousands – of dollars a year. Some of the best travel credit cards offer 100,000 points to new accounts when you meet reasonable spending requirements.
As a private lender, you can lend to anyone in your social circle. For example, many home rehabbers need access to a source of capital they can tap into very quickly in order to fund the initial purchase of their properties. You can partner with a rehabber who uses your capital for a short-term in exchange for an interest rate that is mutually agreed upon.
In Eric Reis’s The Lean Startup, a fantastic book about how today’s entrepreneurs and startup companies are approaching the way they create and innovate, Eric talks about how vital it is to use validated learning and scientific experimentation to be able to steer a company in the right direction. In other words, to use customer feedback and quantified data analysis (of real, non-vanity metrics) from a minimal viable product to make decisions and pivot a business one way or another.
Greg Johnson is a personal finance and frugal travel expert who leveraged his online business to quit his 9-5 job, spend more time with his family, and travel the world. With his wife Holly, Greg co-owns two websites – Club Thrifty and Travel Blue Book. The couple has also co-authored a book, Zero Down Your Debt: Reclaim Your Income and Build a Life You'll Love. Find him on Instagram, Facebook, and Twitter @ClubThrifty.

The appeal of these passive income sources is that you can diversify across many small investments, rather than in a handful of large ones. When you invest directly in real estate, you have to commit a lot of capital to individual projects. When you invest in these crowdfunded investments, you can spread your money across many uncorrelated real estate ventures so individual investments don't cause significant issues.
Focus on your primary passive income stream first. It's difficult to grow your passive income into multiple streams if you don't already have one, solid stream. Focus all of your efforts on that one project first and help it grow as productive as possible. Then, you can take the money you've made and lessons you've learned from this passive income stream and put them into others. 

Finally, I imagine the biggest debate with my ranking is Creating Your Own Product as the #1 passive income source. If most people have never created their own product, then it’s easy to give it a thumbs down. There won’t be much complaint about Private Equity Investing being in last place because most people are not accredited investors. But given I believe that plenty of people can create their own product if they try, pushback is inevitable because a lot of people simply don’t try!
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If you’ve ever thought to yourself, “I wish there was a product that did this,” then invent it! Create a product, medical or otherwise, and sell it as a company or get royalties for it. It’s not impossible to figure out, I have many friends who have taken a concept to market. Don’t overlook an invention as a fantastic means of attaining passive income.