A very well-researched article! Where I live, a quick and easy way to make cash is to teach home tuition to primary schools children. Teachers here aren’t that good so parents are always eager to get children extra help. And parents don’t even care if you have a relevant degree or not. You just need to read the child’s textbook and repeat everything the teacher taught at school and make the kid do his or her homework. How simple for us and how sad for the education system 🙂
Websites such as Upwork, Fiverr and Freelancer offer opportunities to do a variety of freelance jobs, such as writing, programming, design, marketing, data entry and being a virtual assistant. Fluent in a second language? Check sites such as Gengo or One Hour Translation, or drum up business through a site of your own. No matter what kind of freelancing you do, keep track of the going rate for the kind of work you provide so you know if you’re charging too much or too little. Learn how to get started on Upwork.
Join a startup accelerator: Another great option is to apply to a startup accelerator like Y Combinator, 500 startups, or TechStars, where a group of investors will help coach you, connect you with potential partners, and provide startup cash in return for a small stake in your company. The competition is tough to get into these, so don’t rely on them as your only path forward.
If there’s a plasma donation center in your area, you might be able to make anywhere from $25 to $50, and odds are, you’ll get paid today. Call ahead and ask, of course, but these days, many donation centers are giving money cards (similar to a debit card). Generally, it takes about 30 minutes to donate your plasma, but a first visit may take longer — up to two hours — since you’ll be filling out paperwork and taking a physical. And while it’s not a ton of money, many donors are able to sell plasma twice a week.
If you want to clear some space out in your house and have a big stack of books you’ve been holding onto for too long, you can make money selling your books and textbooks online. Stores like Half Priced Books and others will give you cents on the dollar for each of your current books while you can check what your book is worth by simply entering the ISBN number on Book Scouter.
If my piece of content is so unique and valuable around hiking backpack recommendations, that other reputable outdoor websites are willing to link to it and build the page’s authority, then I’d have a very real opportunity to rank high in organic search for these search terms (meaning, my page will come up first when someone searches for hiking backpacks). 
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