Another option is to take photos locally for homeowners. Many people don't have good home listing photos of the home they're trying to sell. If you notice, many of these pictures, aside from the ones done by professional photographers, have bad lighting, show clutter, etc. If you're good at taking pictures and have a nice camera, you might be able to sell your photo taking services to real estate agents or to people trying to sell their own home.

It's a little more involved. Companies, especially those with stores, will want to get the opinion of the customer as they go through a transaction. For a bank, it might be opening up an account. For a retail clothing store, it might be trying on a shirt and checking out. Sometimes it's just calling up their customer service line with a problem and seeing how the representative treats you.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 
Years ago, I joined Epinions and wrote reviews of products I liked. The model was simple – write a review, get paid a little for every pageview and every commissionable sale the review generated. It was a fun little foray into the Internet and getting paid to write about a product seemed fun. Epinions was later acquired by eBay and shuttered in 2014.
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
And there is no need to be nervous about making such a change to your W-4. The withholding allowances you enter into your W-4 do not determine your tax bill, just how much you pay per paycheck. That means it’s perfectly legal to change the withholding allowances on your W-4, provided you claim the correct number of allowances on your actual tax return.
To get hired, you fill out an application and take an exam to test your knowledge. “If you pass, you go through a mock session with an experienced tutor who assumes the role of student and evaluates your creativity, empathy and teaching skills,” says Cindy Hamen Farrar, Ph.D., senior director of academic tutoring at Tutor. “We look for people who know their subject matter and who can break it down and communicate effectively.”
Fiverr – Fiverr is a huge marketplace where you can sell all kinds of work. From products, like drawings and videos, to services, like a review of your website or resume. Fiverr's differentiator is everything costs just $5 at a baseline, though you can sell add-ons like faster delivery, etc; for more. The marketplace is huge and there's a lot of fun and creative things you can do.

Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.
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