There are three main categories of income: active income, passive income and portfolio income. Passive income has been a relatively loosely used term in recent years. Colloquially, it’s been used to define money being earned regularly with little or no effort on the part of the person receiving it. Popular types of passive income include real estate, peer-to-peer (P2P) lending and dividend stocks. Proponents of earning passive income tend to be boosters of a work-from-home and be-your-own-boss professional lifestyle. The type of earnings people usually associate with this are gains on stocks, interest, retirement pay, lottery winnings, online work and capital gains. 
If you are not able to get a mortgage on the property, there are still a few options available though rates can be fairly high. You might try approaching the seller for owner financing where they sell the property to you on monthly installments. This might not be possible if there’s a mortgage on the property since many carry a “due on sale” clause. If you do go this route, make absolutely sure you get a notarized contract with all the details.
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.
For someone my age, I have an extremely low risk portfolio of mutual funds, foreign currency, and bonds. It’s made a bit more risky by my recent exposure to cryptocurrency, but that’s the only “high risk” activity going on here. Nothing exciting, but it pays some nice dividends and beats the hell out of keeping money in a savings account. This is a way for me to hedge against the risk I incur by angel investing in startups.
The term affiliate marketing has taken a bad rap over the years, primarily because people are abusing just how easy this is to do. Internet marketers are finding products they don’t even use because they come with a sweet commission, and are spamming everyone until they either buy, or unsubscribe. This is also known as the dark side of affiliate marketing.
I will share what we did, because it’s an incredible success story. We used an existing tax loophole where if you sell your primary residence (after having lived there at least two years) you get to keep your profit tax-free. So, we stair-stepped. We bought house after house, at least two years apart, used the profit money to pay down on the next house (so on and so forth, yadda yadda) building up equity as we went along… and now, we own a $600,000 house debt-free. And now we are using our paid-off home as leverage to borrow money to buy commercial buildings to rent out. I like commercial because it’s a BUSINESS transaction… kids, pets, other wear and tear that you see with residential rentals is nonexistent. People take care of their business space much better than residential. You have to be in a good area for renting out commercial – a thriving business community – to make this work. But that’s how we “made it”, and though it took 15 years, we will have residual income to take care of us when we’re old enough to retire. People made fun of us for moving so much, but who’s laughing now? 😉 Oh, and our child only had to change schools once (and we wanted to anyway) because we stayed in the same general area as we moved around. We were careful not to disrupt his life too much.
They've delegated, automated, streamlined, systematized, etc. Not with the intention of sitting on some beach somewhere for the rest of their lives and watching the checks roll in, but with the intention of freeing up their time to create even more value that they're inspired to create, either by leading that business to the next level of greatness and service to greater audiences, or by starting a new business.
Another benefit, which many online entrepreneurs do not even consider, is that you don’t need to create the whole product before launching it. You only need to create a small portion of your actual content, and complete it only after you get your first member during his membership - that means you get paid IN ADVANCE of actually creating your site content. It also means that you can modify your content based on LIVE feedback from paying customers. More importantly, this is a great way to VALIDATE your site and ensure you create a product based on what customers want, not just what you think they want.
Before you buy any property, an inspection by a professional and independent home inspector is essential. Even if your potential purchase has just undergone a beautiful renovation, you must find out if the wiring and plumbing are all up to code. In most areas, it’s illegal to operate a rental property with any code violations. A top-quality inspector will be able to estimate the remaining life of the roof, HVAC system, and hot water supply, as well as find any defects in the structure, such as dry-rot in the attic.
Creating passive income is the key to retiring, especially retiring early. If you want to retire early with the stock market you will have to save a huge amount of money, because that money has to last so long and retirement calculators depend on you using your investment to fund your life. With passive income you will have income coming in as long as you own the investment, without every eating away at the principle invested. Creating passive income may take more work than investing in the stock market, but I think it is well worth the extra effort!