Obviously some of these small business ideas have more earning potential than others, but what they all share in common are relatively low barriers to entry and the flexibility to work at them for a limited amount of time per week. I also tried to focus on side business ideas that have some sort of online component to them, since that's what I love most.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 

Build your audience on a course community: If you’re just getting started building an audience for yourself and want to leverage communities already actively looking for content you can choose to host and sell your online course on a site like Skillshare or Udemy. These are easy, cost-effective ways to build an audience and test your niche to see if there’s demand for it.
How to Get It: Check out K12 (K12.com) and Connections Academy (ConnectionsAcademy.com). Both organizations offer various benefits — including health insurance, retirement savings accounts and paid time off — depending on where you live. As in any job where you work with kids, there will be a background and reference check as well as interviews. You may also need to be licensed to teach in the state where the students reside.
Do you play a musical instrument well enough to teach it to others? How about taking your skills at producing music or sound design and teaching others as a service-based business idea based on your experience? Private music instructors in all disciplines charge upwards of $20-100/hr (or more depending upon skill and experience), and you don’t necessarily have to do them in person, either. This makes for a great side business idea that can channel your passion for music into profits.
Many courses exist (many of which, logically, are offered online) where you can learn the language of website creation and can learn about the details, like how to set up shopping cart systems, security concerns, etc. You will, of course, need to learn about each company you design for. What is the atmosphere of the company that you need to reflect in the website design--is it wild and contemporary, meaning brilliant colors and fun graphics? Or will more classic colors like black, navy blue and maroon be more appropriate?
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 

Selection. One of the keys to success on Etsy is selection, according to industry insiders. In fact, the goal of most serious shop owners is to have at least 200 items for sale. If you’re creating all of those items yourself, that’s a pretty big time commitment. But the more options you give to your customers, the higher the chances that you’ll make a sale.
Really great ideas, I’ve started with teaching english to Chinese children a month ago and am really satisfied. I feel that it allows for enough free time and still provides a lot of money for the time and work invested. I am using a different system that you are saying, but will try the one that you recommended. I wanted to go into proofreading, but I feel that my english is not great enough, so I would not do good. Also, I’m not really a person that always sees all the details. So, teaching english, my next lesson is in 6 hours.

It sounds too good to be true—getting paid to represent your favorite brands at events across the nation. But, if you have a friendly and outgoing personality (a growing social media following helps too), you can forge a potentially paid relationship as a brand ambassador with companies who want to reach other people within your community with this  side business idea. As a Brand Ambassador, you do anything from demoing the latest technology, to passing out free swag at music festivals, to going on nationwide tours, to pumping people up as a mascot, and more. Depending upon the gig, you can expect to earn anywhere from $18-$100/hr. You can get started as early as this weekend by joining the Brand Ambassador Facebook group for your nearest major city (e.g. join the "Brand Ambassadors of Seattle" group if you live in/near Seattle). Once you've been approved to the group, you'll get access to daily job postings from big brands and agencies with opportunities in your area. All you need to do is submit your resume and headshot to apply. For a step-by-step guide on how to get hired for the best gigs and the highest pay rates, I recommend checking out The Brand Ambassador Blueprint.
 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.      
Valentine's day. Birthdays. Weddings. The list goes on and on—throughout the course of a year, there are dozens of occasions when people need to order flowers. What's more is that once you're up to speed with this business idea, your costs can stay relatively low if you know where to source your flowers, and typical margins are in the neighborhood of 300% (or more) on cut flowers which makes this a particularly profitable side business idea in the right geographic area. Check out this amazing interview with floral designer, Sara Tedford of Ladybird Poppy to hear about how her floral design company started out as a side business idea of doing weddings and events for her friends and family.
If keeping your home organized comes naturally and you enjoy helping other people, consider becoming a professional organizer as a side business idea. As the need for baby boomers to start downsizing grows, you can use your organizing and decluttering skills to start making an industry standard $50-125 an hour with very little startup costs and some free expert advice from Jen Kilbourne. Believe it or not, pro organizers don't just work with hoarders. More and more people are hiring professional organizers in order stop wasting time and money due to the stress of everyday disorganization. What's even better, is that you can take this on as a side business idea during the nights and weekends when your clients will be at home.
While this is not technically “at home,” you can still earn great money without ever getting on the phone using your personal car, bike, or scooter to deliver food, give people rides, and even picking up groceries. The great thing about these companies is that it's also very flexible work. No one is telling you when to start and stop. You just do as much work as you can, when you can.
“I love working for TTEC@home. I get to interact with and help others from the comfort of my own home. (Have you ever been in Houston traffic rush hour? That says it all!) Plus, they have some of the most amazing people I’ve ever had the privilege of working with. They aren’t just here to draw a paycheck. They truly care about their co-workers. I work many miles from the brick and mortar buildings, but I have a sense of security that my coworkers have my back and I’m not alone.”
Perhaps you’re raising kids and you’re committed to not using daycare. Maybe you’re a little older and can’t commit to a full-time job. Or you might be injured or disabled, making it difficult for you to leave your home each day. Whatever your reason is, if you’re stuck at home most of the day, you’ve probably thought about the income you could be making by taking a work-from-home job or running your own business.
Nice writing style Ben. I’m finding out very quickly that to make any money writing, you have to read, read, and then read some more, no matter how smart you feel you are on a subject, before writing your first sentence. I have always been a fan of multiple income streams and am thrilled by the ideas of proofreading, editing, blogging, freelancing and transcribing. Having spent one of my careers doing just that for a large corporation, it’s a perfect fit, but now I can get credit for my work, thanks again for a great article.
Ebooks can be a hard path to online success too, from my personal experience but as you rightly said, it can be a great gateway vehicle to drive traffic to other monetized sites. Having said that though, getting your ebook on Amazon, Barnes & Noble, Lulu, Smaswords etc., is a great way to get noticed and make money overtime. An arresting e-book cover is a MUST! And if you are a DIY freak like me, you could do your own e-book cover for $0. I also use a graphic design software similar to Philip’s.
Obviously some of these small business ideas have more earning potential than others, but what they all share in common are relatively low barriers to entry and the flexibility to work at them for a limited amount of time per week. I also tried to focus on side business ideas that have some sort of online component to them, since that's what I love most.
But if you do go the fashion route, be prepared to do quite a bit of networking before you get your business off the ground. Don’t be afraid to do free consultations for contests and giveaways. The more word gets around about your fabulous fashion sense, the larger a clientele you’ll build. If you’re really good, you can start this business with little to no training.
Service. Another key aspect of successful B&Bs is the level of service that the hosts provide. You’re not just offering room and board, but an experience. If they need help planning a day seeing the sites, offer to sit down with them and help them plan their itinerary. If a businessperson needs copies for a presentation, offer to go and make them. Remember, your job as host will be to make your guests’ stays as comfortable and pleasurable as possible. If you succeed, they’ll remember you the next time they travel through your town.
Not too keen on shuttling people around? We totally get it. How about dropping off a to-go order of burgers and fries instead? Driving for Uber Eats, Grubhub or Postmates is a great way to make extra money in your free time just by delivering food to hungry clients. Bonus points: Your car is going to smell amazing. We’re already kind of jealous of you, really.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.
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