The first follows the startup path we outlined above: You have a disruptive idea for an app or piece of software, you validate the idea with real customers, and then raise money to hire developers or a development studio to build, launch, and scale your software. If you’ve done everything right, your software will be accepted to the Apple and Google Stores and you’ll make money every time someone downloads it or pays for a premium feature.
Do you want to build software, apps, or websites? Then take that interest and turn it into a profitable side gig. Of course, you first need to have an understanding of computer programming and coding, and settle on a specific programming niche. Once you do, you'll be on your way to joining a fast growing industry that allows you to work whenever and wherever you want. Here is a guide to programming to help you master your skills and know where to start.
Complete errands or tasks for the elderly. Older people often need help with buying groceries, cleaning their home, performing home maintenance, and paying bills. To find clients, contact your local community center or church to find out if anyone needs help. Additionally, you might post an ad in your local classifieds or talk to people you know to find out if they know someone who needs help.[5]
Consulting can be a way to make a meaningful sum on the side, if you have some business insights that companies will pay for. For example, you might be savvy about fundraising for non-profits, or you might have a talent for finding good workers for a certain industry. Think about what you have to offer to what kind of company, and what problems of theirs you can solve. A little Googling about how to go about starting a consulting business will turn up some sound advice.
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.

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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