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
 Thanks for your response Phil.  I see where you’re coming from with regards to sensitivity.  It DOES seem, however, that truth and clarity can be expressed with so much more civility in this world of ours where so little of that seems to exist these days.  Truth and clarity expressed elegantly and with civility will always be better received and, hence, achieve better and longer lasting results, than when expressed brashly or without regard for the experience and perspective of those who may see things a little differently.      
Etsy: While Etsy's popularity has declined recently, it's still a great resource for selling handmade items online. No need for complex ecommerce sites or merchant accounts or any sort of automation. The company takes a commission of every sale and charges a small listing fee per item. But many still use Etsy as their primary source of income. The best part is that you can also sell digital products such as poster designs. 
Monetize a hobby. While some hobbies actually cost money, others can be transformed into a profitable business venture. Ultimately, it depends on what your hobby is and how talented you are. You could turn your love of photography, for example, into a part-time gig taking family portraits and wedding photos or selling prints on Etsy or at arts fairs.
High-ticket consulting or coaching: You could sell your own high-ticket consulting or coaching products from your website. You'll still need a website, merchant account, sales funnel, lead magnet and many other items. But you can easily earn a substantial amount of money from each individual customer, making it well worth the arduous setup required. 
Español: ganar dinero, Deutsch: Geld verdienen, Português: Ganhar Dinheiro, Italiano: Fare Soldi, Nederlands: Geld verdienen, Français: gagner de l'argent facilement et rapidement, Русский: много зарабатывать, 中文: 赚钱, Čeština: Jak vydělat peníze, Bahasa Indonesia: Menghasilkan Uang, العربية: ربح المال, Tiếng Việt: Kiếm tiền, 日本語: お金を稼ぐ, 한국어: 돈 버는 방법, Türkçe: Nasıl Para Kazanılır, हिन्दी: पैसे बनाएँ (Kaise Paise Kamaye, Make Money)
You could easily do home organizing for people, an industry that has gained a lot of popularity since the debut of Netflix's hit series Tidying Up with Marie Kondo. If you're a tidy and organized person yourself, and you're good at organizing spaces, why not offer your services to people around you? You'd be surprised at how many people, even on your own social media feed, might take you up on doing something like this.
If you hook up with a for-hire car parking service (the type hired out for fancy neighborhood parties) you can make some nice cash tips in just a few hours at night and on the weekend, when parties are held. The key here is to do a great job by showing hustle and being super friendly. This was one of the most enjoyable jobs I had during graduate school. Who doesn’t like to drive nice cars?
Set up an account on Rover.com. Enjoy furry company once in a while? These days, many professional pet-sitters set up an account on Rover.com. With Rover.com, you can reach people in your area who are actively looking for someone to watch their dogs, cats, hamsters, or turtles, either in their home or your own. You can set your own rules and schedule and come up with your own pricing through the Rover.com pet-sitting platform.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass).
Try night filling for supermarkets/large stores, supermarket/retail cashiers, vacation seasonal factory work/seasonal fruit picking, night reception in a small hotel, cleaning, gas station attendant, making crafts or artwork and selling online, YouTube video making (but it needs to be popular), dog walking, babysitting, tutoring, housesitting, etc. There are many part-time options where college students are favored because people get to pay you less than a service provider but get to know you better, so it's a friendlier arrangement.

Mostly simply, “micro jobs are small, easy tasks that can be completed in a short amount of time, and generally earn you between $3 and $100. They’re often online jobs that you can do from home, but there are local opportunities, too. They don’t require an interview, meetings, or set hours, which makes them the perfect vehicle for making extra money on the side.”
29. Videos – This could be an entire section on it’s own. Many people have made money by creating YouTube videos. Evan of EvanTube is a kid and he has made millions by creating reviews of products that other kids his age would use. It’s not easy to get views into the millions, but once you do, you’ll start seeing some cash come in. Many bloggers have completely turned to videos to get their point across by starting a video blog.
My local Craigslist.org is the first place I go to sell something. It’s best for items you think will appeal to everyone (therefore justifying the smaller audience) and large items that can’t be shipped. Craigslist.org is great for taking your yard sale items online for local sales. For example, a friend recently bought two fans from people that live close to him. These one-off type items do very well on Craigslist. Just remember to use common sense and be safe out there.
Another great way to passively earn through Swagbucks is to take advantage of their search tool. Swagbucks will pay you micro-amounts for eligible searches you complete using their search engine. There is a daily cap on earnings, and they don’t fully disclose what constitutes an eligible search (to prevent abuse), but it’s an easy way to make a few extra dollars a month without much effort. By signing up through our link, they give you a free $10 bonus to unlock. Boom.
Amazon makes it fairly easy to list and sell old books, games and devices on its marketplace. You can make more than just a few bucks If you have pricey textbooks from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart or games that are scratched up. Remember, be upfront about any defects, no matter how small they might be and no matter how few people might readily notice it. 
Set up an account on Rover.com. Enjoy furry company once in a while? These days, many professional pet-sitters set up an account on Rover.com. With Rover.com, you can reach people in your area who are actively looking for someone to watch their dogs, cats, hamsters, or turtles, either in their home or your own. You can set your own rules and schedule and come up with your own pricing through the Rover.com pet-sitting platform.
If you love animals and live in an urban area then walking dog is a viable side hustle idea. People are busy going to work each day and are forced to leave their animals stuck in the house. This is not good for the dog or the owner. Not only because dogs get lonely and need to be around people, but also because they deserve fresh air and the chance to go to the bathroom outside!
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