If you own an automobile then capitalize on it by renting it out whenever you're not using it through sites like Turo and Getaround. If you want to keep your keys, then you can become a driver for either Uber or Lyft. Depending on where you live, you may be able to earn $35 per hour. One final option would be to register your car as an airport shuttle service vehicle and take people to and from the airport.
Disagree with the photography idea. It may seem easy but there are those of us who have spent, in my case 10 + years learning the light, the technical aspects, the right way to pose… we have to keep pushing our prices higher because there are more people starting to eat away at the client base by undercutting…. and we’re trying to make money and feed families too. It only hurts an industry to undercut. Sorry. Good list otherwise, don’t do it as an expense to others.
Overall good ideas, but we need to define the idea of ‘fast 100 bucks. Swagbucks is pretty slow as an income resource and it would take a while, not to mention selling stock photos is not something you do in 2 days. I tried this 4 years ago with my close to pro’ photos and it took days to set up a small portfolio there with some outstanding work and yet made no sells.

Whether it’s an important consumer application, a specialist app to solve a particular niche problem, or even a time-wasting game you can play on your phone, you can create a massively successful business if you build software that helps people. (Look at the rise of Slack—the team communication software that went from side project to billion-dollar company in just 2 years.)
Do you enjoy fast food or going into retail shops? Many companies hire mystery shoppers to test the customer service of their stores. A common one is Subway, which hires mystery shoppers to ensure that "Sandwich Artists" are following all the franchise guidelines. If you have time and can travel to different places, this could be a good side hustle.
Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income. 
Not only will this multiply the money you’re bringing in in a serious way, but it protects you against any sudden changes in the market or in your business. Remember that old saying about putting all your eggs in one basket? A few hours a week committed to just one or two of the following opportunities will put you in a much stronger position to be financially safe and independent.
Get a job as an umpire or referee. Do you love sports? Then read up on your favorite game’s rules and get paid to ref! For around $15 per hour-long game, you will get a little bit of extra cash for participating in your favorite sports. Make sure you are clear on the rules though, as you may have to deal with unhappy players if you make a bad call by accident.
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.
Writing a résumé can get tricky. Even if you have the education and experience to secure a job position, the wrong words could place your résumé at the bottom of the pile. That's when you turn to talented individuals who have a knack for writing amazing résumés. If that sounds like you, you can either offer this service to anyone in your network or work part-time for ResumeEdge.
There are many ways to get people onto your list. Lead magnets are one such resource. For example, you can build ebooks, checklists and cheat sheets. But you can also do content upgrades, such as PDF versions of an article with added resources in them, four-part video training series, and more. Think about your audience and what you can offer them to better serve them, then treat them with some respect and you'll eventually reap the rewards.
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. 
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