Holly told me she started writing content in 2011. At the time, she still worked a full-time job but created content online part-time to supplement her income. Over time, she was able to double and triple her rates until she could quit her full-time job to write. These days, she makes bank as a freelance writer and teaches others to do the same via her online course, Earn More Writing.
Set up a roadside stand. Depending on where you live, you could profit handsomely by setting up a roadside stand. If you live near a resort area, for example, you could buy cases of bottled water, put them on ice, and sell them to passers by for twice what you paid. Selling fruit and produce you grow yourself is also a smart idea in highly-traveled areas.

Skillshare is more of a social learning platform where you can teach real-world skills. The range of skills that you can teach is only limited by your imagination - from board game strategies, garment construction, cooking tutorials, travel hacking, and relationship tips. I even saw a course on how to build a grown man's wardrobe. Creating a class on Skillshare is free. For each student who enrolls, Skillshare takes a 30% fee (Similar to Udemy). You are also provided a unique teacher referral link that lowers the fee to 15% for students who enroll via your referral. Note that all online courses on Skillshare go through an approval process based on specific criteria.
What I find most interesting is the fact that I had never considered options like LendingTree or realityshares for other income sources. Investing in property has been too much of bad luck for people that I know personally, so I am interesting in getting involved in a situation where I would have to be dealing with maintenance issues or tenants. There are services for you to do that, but I had not come across any that didn’t eat most if not all of the earnings. Then again, I live in the NY area. Investing in the midwest would not be reasonably possible for me, directly, but reading about realityshares is something I am going to look into further. That might be a real possibility.
Become a proofreader. All kinds of businesses hire professional proofreaders to look over their copy and content for errors before they publish. This side hustle is one that could work for nearly anyone since you can work from home provided you have a computer and an internet connection. You can find online proofreading jobs through websites like Indeed.com and FlexJobs.com
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.
While cryptocurrency is still relatively new, it will ultimately become the standard. Bitcoin and Etherium might be the primary cryptocurrency platforms today, but the US Dollar will eventually become the Digital Dollar by leveraging the blockchain. You can take advantage of the current boom in cryptocurrency by trading it through platforms like eToro and Kraken, amongst many others. 
Watch other people’s kids along with your own. There’s a good chance your friends who work outside of their homes would be thrilled to have an experienced parent watch their children while they are at the office. It can be manageable if your friend in need has only one or two kids. Plus, the new playmates will help keep your children occupied for a few hours. Pay varies widely based on where you live and the ages and number of kids you'll be watching, but babysitters and nannies typically can make up to $10 an hour in small cities and much more – even double that hourly rate – in larger cities.

“Donating plasma is similar to giving blood. A trained staff member called a phlebotomist puts a sterile needle in your arm vein to draw blood. The blood is then cycled through special, sterile equipment that separates plasma from the other parts of your blood. Your plasma is then collected in a container, while the other parts are safely returned to your body. This process is called plasmapheresis.”
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
As I’ve thought more deeply about how to answer this question over the years, I’ve come to a realization that the problem is not the answer, but the question itself. For those who’ve asked it, I don’t think it’s always coming from a place of “quick money.” If we reframe the question, I think there’s room to empower and actually help those who’ve asked it—to give them a foundational understanding of what it really means to generate an income online.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.

If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.
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