If you upload photos of yourself, or friends/family with consent, it's worth going for the 'rights managed' licence option – otherwise you'll have little to no control over how your images are used (eg, you could star in an ad for haemorrhoid cream). See Alamy's page on understanding stock image licensing for more on the different types of licences.
This can include advertising, but many businesses also need help just filling up their social media profiles with relevant (and consistent) content. If you enjoy learning about social media, and want to take things a step further and make extra money, social media management is a great option. If you’re good at it, it can also open up a lot of doors for you down the road. This is a great article from Small Business Trends on How to Start Your Own Social Media Business.
20. Etsy – If you like to create arts and crafts, you can sell them on Etsy.It’s completely free to open an Etsy store. You simply sign up, post pictures of your creations and starting selling. You can choose your payment option, but PayPal is generally the easiest. Etsy makes it easy to sell and keep track of your inventory. There is a small listing fee and they take 3.5% of every sale you make.
@moxie1956 Thanks for sharing your experience with CashCrate.com. That’s certainly disappointing to hear that you weren’t able to make the $50-$75 a month that I expect. Maybe they are just going through a seasonal downturn or something. Like I mention above though, the real money with Cash Crate comes in the referrals. Find a way to consistently refer a large amount of people to the site.

Every successful business has an automated sales funnel. Yet, so many businesses are completely unaware of the power of an effective funnel. Sales funnels provide automation in the sales process. They help you build a relationship with your audience and develop a bond with the consumer. There are plenty of tools you can use to build a sales funnel, but the world's most successful businesses often create custom-coded funnels.
Fiverr is one of the biggest providers in the gig economy on the web and you can sell a wide variety of services and products through this medium. Do the research and find out what you can offer. However, keep in mind that like any other money-making task, it takes time to succeed here. And stellar reviews will help you generate more and more income over time.
Just be prepared for the slow game with this one. You can definitely make good money with a blog . . . but you can also end up making next to nothing. Okay, maybe that’s extreme. But you get the idea. Using things like Google AdSense or affiliate marketing (where you get a commission when someone buys a product you promote) and even connecting with the right people can really impact your readership and the cash you make. 
Experience. Whatever area you want to work in as a consultant, you must be able to show clients that you’re qualified to advise them. If there are organizations related to your field, make sure that you’re a member of them. Similarly, if you can take a course and become certified or registered in your field, do it and then add that to your credentials.
I see a comment made by Stella including some freelance sites. This does work. I use oDesk and it’s been a big help in bringing in a little extra money. I also agree with some of the other comments that mention people should think of or view more ideas of making extra money, because it really is possible to make extra money instead of just sitting around moping about not having money to pay the bills or buy something special.
Are you skilled at a few special recipes or are your friends going crazy over your cakes? You know who you are. It might be time to take your talents to the making some extra money. People love to buy homemade goods, especially when you have a signature item or a story behind it. You can contract your items out for parties, meetings, etc. Or, consider holiday sales for local Christmas parties, birthdays and more.
Nielsen (the same company that creates TV show ratings) has a research division that is similar to what survey companies do, which is gather information to help companies better market themselves to customers. Instead of having you take surveys, though, their computer and mobile panel is focused on gathering information pertaining to your “unique internet usage with people like you to build a picture of internet behavior.”
I’ve tried a fair few things on this list and I’m a big fan of those side hustles that have the potential for ongoing passive income once you’re set up. For me, the most successful have been blogging and T shirt designs (I use Merch by Amazon but want to look into Teespring as you suggest). I’m currently working on an Etsy printable business, again for the passive income potential!
Here’s the best part: Pair your Bank Account with a Varo Savings Account where you’ll earn 2.12% Annual Percentage Yield (APY) with the opportunity to earn up to 2.80% APY on up to $50,000 in savings. To qualify for the 2.80% rate, you’ll need to have payroll or government direct deposits of $1,000 or more and authorize at least five purchases with your Varo debit card each month.

You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service and refunds. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. It is hard work, especially on your own. You could opt for Amazon's platform, which might be an easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
Are you seeing the possibilities here? Think about what book, or series of books you could write to help people in your field of expertise? You might start with an eBook offered on your own website that covers the basics. Use the eBook as an opportunity to tell people about your more in-depth book on Amazon and finally, follow through with an advanced book offering.
eBay: eBay is one of the most popular websites in the world, period. That means it’s a great way to attract lots of eyeballs to your unwanted items, fast. Initially designed as an auction site for DIY sellers, it’s now primarily a venue for fixed-price (though often heavily discounted) sales by professional merchants. Still, as long as you include high-quality photographs and thorough descriptions in your product listings, you can likely break through the noise. eBay’s fee schedule is complex, but as a general rule, expect to lose 10% of your final selling price to the site’s commission.
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