If you know anything well, a place, how to fix something, how to make something, how to do something, you can write a guide for it. You can sell your guide as an e-book, offer it as a download for a fee on your site or reach out to bloggers with similar content and ask if they will offer it as a paid download on their website (for a price of course).

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. 

Survey Junkie is among the most straightforward survey sites out there, which puts them at the top of this list. All you have to do is sign up to be eligible for surveys. Once you complete a survey you earn a certain amount of points that you can exchange for cash paid directly to a PayPal account or you can redeem your points for gift cards. Super simple.
Index funds provide you with a way to invest in the stock market that is completely passive. For example, if you invest money in an index fund that is based on the S&P 500 Index, you will be invested in the general market, without having to concern yourself with choosing investments, rebalancing your portfolio, or knowing when to sell or buy individual companies. All that will be handled by the fund which will base the fund portfolio on the makeup of the underlying index.
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.
One of the things I'm surprised your article doesn't mention is the tax advantages of this type of investment. The depreciation and rehab costs (purchasing distressed properties) can be huge deductions to ones income taxes, which none of the others have. Then, along with the appreciation of real estate, this passive income investment outperforms the notion of maxing out my 401k as well.
For example, if you type in “banana bread recipe,” search engines should pull up recipes from major sites first. Posts from smaller blogs or recipes for other, related dishes—like zucchini bread—should fall toward the end of the list. As a search engine evaluator, you’ll be asked to enter specific words or phrases into a search engine, then assess how appropriate and informative the sites it pulls up are.
When most people think of investing opportunities, they think of stocks, bonds, and precious metals. While these are still some of the most common ways to invest, the platforms have evolved, and there are more options than ever. Gone are the days of mountains of paperwork, high brokerage fees and unattainable account minimums. Now you can invest on your own terms.
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!