Perhaps most importantly, though, would-be eBay moguls need to specialize. Just throwing junk online won’t work. Sellers need to know what they want to sell and how they’re going to market it to their audiences. Again, competition is fierce, so research, preparation and strategy are critical. (For reference, eBay itself provides an extensive guide to selling on the site.)

My name is Jamie Spencer and I have spent the past 5 years building money making blogs. After growing tired of the 9-5, commuting and never seeing my family I decided that I wanted to make some changes and launched my first blog. Since then I have launched lots of successful niche blogs and after selling my survivalist blog I decided to teach other people how to do the same.
Persistence and Commitment. You’ll need to have a good amount of persistence while pursuing freelance writing gigs. This business is subjective, and while one person may love your writing, another may not. Do your best to always produce good, solid copy and hold on to your commitment to do the best you can for your clients. Just by committing to do those two things, you’ll be miles ahead of your competition.

It’s not the sort of side business idea that’s covered in glory, but someone needs to make sure all the numbers add up at the end of the year. Every business and most individuals need someone with the domain expertise to help prepare tax returns, especially time or resource-strapped small business owners. Majo Jacinto in his Udemy course provides an in-depth foundational understanding of how to prepare tax returns (and stay current with ever-changing laws) that'll certify you with tax prep skills in as little as a few hours of training and practice.  Then once tax season rolls around you'll be able to charge an average of $229 per return as a freelance tax preparer with this side business idea, according to CNBC.

If you have nice items like cameras and other A/V items, musical instruments, drones, and even toys and other children's items, you can list it online for rent. One of the best places to do this is a funky site called Fat Llama. People are reporting to have made over $1,000 renting out equipment on this platform. Plus, if you sign up using this link, Fat Llama will give you a $20 credit! Get $20 credit with Fat Llama.

Leapforce is always looking for people for this work at home role. Their Search Engine Evaluators “conduct research, evaluation, and feedback on search engine results by measuring the relevance and usefulness of web pages in correlation to predefined queries, by providing a comparative analysis of sets of search engine results and various other techniques.”
There’s more to being a coach or personal trainer than just being fit and loving to exercise. Finding a specialization is important, and licenses might be required for certain types of coaching roles. For instance, a friend in Boston obtained US and European soccer-coaching licenses before opening a successful one-on-one soccer-instruction business.
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.

Decluttr is easy to use. Grab an unwanted item, check that Decluttr buys it (for instance: CDs are great, old clothing is not), and enter its barcode into Decluttr’s “valuation engine” or use your Decluttr smartphone app (iOS and Android) to scan your item directly. You’ll receive an instant price quote that you can accept or decline with no obligation. If you accept, just pack your items into a box large enough to fit them, slap a free Decluttr shipping label on it, and bring it to any authorized UPS location (including drop boxes, if your box contains fewer than 25 items). Decluttr issues your payment the day after your item arrives by PayPal, direct deposit, or paper check. There’s no practical limit to the number of items you can sell: each order is technically limited to 500 items, but you can create as many orders as you like in any given timeframe.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service and refunds. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. It is hard work, especially on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
Similar to selling on Amazon, eBay is a place to make money selling just about anything you can think of as a side business idea, with the added excitement of using the auction selling model to sometimes get way more than you expected for that antique baseball card you picked up at a local street fair. To turn your eBay selling into a legitimate business idea, look for opportunities where you can buy in-demand products at a discount—and later sell them for a profit. Eventually, you can even take the lessons learned from your eBay store and build a full on blog or eCommerce business like what the team over at Gear Hungry has done.
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. 
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