Set up a roadside stand. Depending on where you live, you could profit handsomely by setting up a roadside stand. If you live near a resort area, for example, you could buy cases of bottled water, put them on ice, and sell them to passers by for twice what you paid. Selling fruit and produce you grow yourself is also a smart idea in highly-traveled areas.
Ebates: This app offers a simple way to make money online by buying whatever you're already buying and then getting a cash-back reward. With eBates, there is no scanning receipts. Simply click a link in the app and buy it from the store. You'll automatically be credited with your cash rewards upon purchase along with receiving an email confirmation.  
Offering to walk a group of dogs once or twice a day can really rake in some extra money. You could create signs and hang them up around libraries and churches, or perhaps take the modern approach and sign up with Rover. Rover is an increasingly popular marketplace that connects dog owners to dog walkers in their neighborhood. Check out Rover today.
 @Philip Taylor I was merely using medical science as an example profession. It’s quite obvious that you don’t have any professional courtesy and downplay professions in which you don’t understand. Logo design isn’t just logo design. I don’t know what the profession of a public accountant entails, or a lawyer perhaps, so I’m not going to give advice on matters that I don’t especially have knowledge in.

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 you’re just looking for a quick way to make cash on nights or weekends for a short stretch of time, then maybe this one isn’t for you. But if you’re ready to turn your dream of starting your own business into a reality, there’s never been a better time to do it! Online platforms like Etsy, Amazon FBA and Big Cartel have made it easier than ever.
Look into doing call center work, if that appeals to you. Some call-center jobs can be done from your home, making them extra convenient. These jobs don't tend to pay lavishly -- you may only earn $8 to $10 per hour to start -- but even that can be helpful. Work 12 hours per week earning $9 per hour, and that comes to more than $100 per week and more than $5,000 per year. If you have certain special skills, such as those that could let you be a tech support person, you may be able to earn more. Try Googling terms such as "call center jobs" and see what possibilities you find. Typically, you'll need a landline phone and Internet access, at a minimum -- a quiet room in which to work is also good.
Are you an animal lover at heart? How about making some extra money just by taking a dog for a walk or boarding a cat for the weekend? You can advertise your own pet-sitting business on social media, put up signs throughout your neighborhood, or use a website like Rover. They let you set your schedule and adjust your fees as you see fit. If you do use Rover, keep in mind that they take a cut of what you make.3
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