Naturally, it helps if you already have an online audience you can tap for listening to your regular podcast (like I did), but that hasn't stopped thousands of people from building successful side business ideas into lucrative podcasts—including Alex Blumberg, founder of Gimlet Media who teaches how to use storytelling and launch a podcast. You can also check out this class from podcaster and entrepreneur, Lewis Howes, about how to make money podcasting as a side business idea, which regularly broadcasts for free on CreativeLive.
Larger companies can hire an agency or full-time staff member to run their Facebook and Twitter accounts, but small businesses often have to handle their own social media marketing. With so many responsibilities, business owners are often too busy, overwhelmed or undereducated about the importance of social media to spend time developing and implementing a great social media strategy. As a consultant, you can help them determine the best tactics, posting schedules and content for their target audience. As their follower count grows, so will your business.
On the minus side, working from home can pose challenges, too — for example, having limited space in the home, difficulty separating work from family life, and issues with neighbors. So think about whether your business idea, work style, and family life are a good match for a home-based business. Some businesses and homes are a perfect fit, while others might pose too many challenges.

Counted amongst the most valuable tech giants, Amazon is also a massive global market where virtually anyone can cash in on the rising tide of eCommerce if you have the right business idea. But, like everything else that involves money, you have to do quite a bit of work to earn it. In this case, you need to do tons of research (looking for generic products such as clocks, key chains and mugs to attach your brand to) as well as developing a sensible inside sales strategy that'll help you generate profits from your private label side business idea. For an incredible deep dive on how  to launch this kind of business idea, check out how digital marketer Neil Patel recently did this as a public experiment right here on his blog.
One of the online world’s hottest professions at the moment, this business is a gold mine for the tech-savvy entrepreneurs. While everyone’s slightly obsessed with getting their sites SEO optimized, not many people can actually wrap their heads around this topic. If you decide to go into this field, you can think about offering link building, content creation, on-page SEO optimization and similar one-off packages. 
Expertise is another matter, but remember that writing can take many forms—from resumes to news articles to marketing materials and even thank-you notes. (You can even write for businesstown.com, although that gig doesn’t pay … yet.) There’s probably some form of writing you’re qualified to do. Plus, if you’re good enough with grammar and punctuation, companies will pay you to be a freelance editor. One friend made good money editing posts on a popular travel site.
As your business grows, review, and revise: your business plan to see if you are achieving your goals; your marketing plan, to see what strategies were the most cost-efficient and had the best responses; your customer service plan to see if you are receiving satisfactory feedback; and your financial plan, to review your business’s current financial statement to ensure your business has a positive cash flow.
Starting a pet sitting service requires almost nothing in start-up costs. You do need some general credentials that will cost little or nothing to acquire. Your list of credentials should probably include personal pet ownership--if not currently, at least in the past--as well as other pet-related experience, including working at a pet food store, an animal hospital or other animal-related business. You will need to spend a little to become "bonded." This is known as "honesty insurance," and ensures your clients that you won't get their house keys and make off with their valuables (or that they'll get their money back if you do).
If your mastery of another language is good enough to have the grammar and spelling down, translating is a great side business idea to set up for yourself and can even be done remotely. Flexjobs has literally hundreds of freelance, remote translator jobs available right now and if you're looking to land more remote work on the side of your other pursuits, check out my guide—how to get a remote job (this weekend).
Not only is Airbnb a great way to make money by renting out your spare bedroom or living room couch as a legitimate home-based business idea, but you also have the benefit of meeting new people and making new friends if that's your kind of thing. You can even rent out an entirely new apartment just to manage as an Airbnb side business idea, but don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, you can take this business idea to the next level by offering your guests add-on and personalized experiences for an extra charge. Take Lauren Gheysens' Airbnb-based side business idea, Royal Day Out in London, England for example—where she gives visiting tourists a local's only tour of the city, complete with bespoke 18th century costumes.
With the rise of online craft marketplaces like Etsy, people with decent artisanal skills like sewing and woodworking have an always-open market to sell their products as a side business idea. If you’ve always wanted to design and make clothes by hand, then you can start turning those fashion ideas into real, hand-sewn garments and earn a little bit with this side business idea while you sleep and customers from around the world browse your Etsy & Amazon stores.
Focus on what makes you stand out. If you’re using an ecommerce marketplace, pay particular attention to the quality of the images you use on your page. Good product photography can set your listing apart. But remember, hosting your own ecommerce site isn’t a free pass for using mediocre images either. Either way, customers will rely on images to form an opinion about your product or service’s value.
The whole “building an audience” is challenging for me. I’m not much of a blog subscriber myself, and so I’m really not quite sure what makes a blog tasty enough for someone to subscribe to. I solve more of a technical business problem… one of those things that if you need it, you REALLY need it now. And if you don’t need it, then you’re not really interested in getting weekly updates talking about it (I would imagine).
Driving for one of the two globally expanding app-centric taxi alternative services, Uber or Lyft can still be a fairly lucrative way to earn money as a side business idea on nights and weekends—working only when you want. But before you dive head first into this side business idea, do your homework and calculate the costs of extra gas, mileage, tires, wear & tear and usage on your vehicle—it's not a guaranteed business idea that'll turn a huge profit every weekend.
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