Buy and sell domain names. If you’re good at finding popular yet undiscovered domain names, you can make some cash on the side by buying and reselling websites. Think of it as digital real estate speculation. Domains are available on GoDaddy.com for as little as $2.99 per year, but are sometimes resold at far higher prices: According to Business Insider, the site MM.com sold for $1.2 million dollars in 2014. Once you find the perfect domain name to resell, you can market it on Flippa.com for a flat fee.
While you could launch a regular business selling someone else's products, you could also invent your own product, like billionaire fitness pioneer, Howard Panes who teamed up with Ab Roller creator, Don Brown to create the Stealth, a fitness system that gamifies core workouts. While businesses based on inventions might seem more complex to create, they do present attractive investment opportunities as depicted on popular shows like billionaire, Mark Cuban, and Daymond John's, Shark Tank.
If watching children is more your thing, check out Sittercity. You can sign up in minutes to be a baby sitter in your area. You do have to clear a background check, but that's quick - and then you can start getting gigs nearby. One of the best things to do is be available for last minute needs - they pay well and can likely work around your schedule.
If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
Affiliate marketing presents a very low friction entry into selling products online. While you do need some type of audience to sell these products or services to, you could make a significant amount of money from home while doing it. Some products or services have very high earnings per click. That means, if you play your cards right, you could easily make a large profit on conversions by driving traffic to specific offers as long as you target the right interests.

This can include advertising, but many businesses also need help just filling up their social media profiles with relevant (and consistent) content. If you enjoy learning about social media and want to take things a step further and make extra money, social media management is a great option. If you’re good at it, it can also open up a lot of doors for you down the road. This is a great article from Small Biz Trends on How to Start Your Own Social Media Business.

If you love children and want a career in childcare from your home, then a home daycare center could be right for you. Starting a home daycare center, like any home business, takes a lot of work, research, start-up costs and networking to get it going. Every state has different regulations, which could require physical improvements to your home. Learn more about starting a home daycare.
 @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.
Like Airbnb, becoming a ridesharing driver for companies like Uber, Lyft or Sidecar is a way to join the shared economy. And though it is not technically earning money from home,  it allows the same kind of flexibility and it is a way to use an asset you already own (i.e. your car) to make money. There are things to keep in mind, though, about driving other people such as whether your car insurance will cover you and how you pay taxes on your earnings. 
 If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).
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