Earnest (refinance your student loans): Same idea as above but on your student loans. There is $1.4 trillion in student loan debt outstanding. When you have student loan debt, it can make it hard to get ahead, invest, or to buy a home. If this sounds familiar, refinancing the debt can not only help you pay it off more quickly, but it can save you money on interest too.
There are several ways to make money from your car such as taxiing people, renting your car, or advertising businesses. Run the numbers before using your car to make money, especially if you're driving more than usual because it might cost more than you earn to use your car as a money-maker. Factor in depreciation, wear and tear, and gas expenses when you decide if driving is a cost-effective way to make extra money. 
Next Day Payment: When you sell on Decluttr, you receive payment within 24 hours after the sale completes and the item arrives at the new owner’s address. That’s substantially faster than many online consignment platforms, which tend to have more flexible payment terms. And it’s much more predictable than auction sites or venues for third party sellers (including Amazon), which typically allow buyers and sellers to work out their own payment arrangements.
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. 

The second (and cheaper) path assumes that you have the design and dev chops yourself to build your dream software. Naturally, it’ll take more time to get your product off the ground, but being able to bootstrap the development of your software lets you retain more ownership in your business and be more in control of your path, making this a lower-cost, but higher time investment to make money selling apps.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 

The music industry might not be as strong as it was in the 80s, but there are still plenty of ways to make money online as a musician. Sites like SoundBetter let you sell your services as a songwriter, producer, or session musician to thousands of customers a month. While Musicbed, Music Vine, Marmoset, and SongFreedom are perfect for licensing your music to TV shows, movies, and web series.
High-ticket consulting or coaching: You could sell your own high-ticket consulting or coaching products from your website. You'll still need a website, merchant account, sales funnel, lead magnet and many other items. But you can easily earn a substantial amount of money from each individual customer, making it well worth the arduous setup required. 
For example, if you register for free with Textbroker.com and submit a writing sample, you’ll receive a rating based on your content quality. Then you can choose which projects you want based on your quality rating and earn 0.7 cent to 5 cents per word, or more. FreelanceWriting.com provides a long list of freelance writing opportunities culled from several top sites. Many of the recent listings offered hourly rates of $25 or more. For $21 a month, you can join Mediabistro’s freelance marketplace to post your qualifications for review by media managers seeking writers.
Research Pricing (And Set Fair Starting Prices): Before setting prices for each item, research your local Craigslist website and (if possible) nearby yard sales to get a sense of how to price them. Remember that many buyers will try to haggle – so set prices a bit higher than your bottom dollar, but not so high that you’ll scare off first bids. 10% to 15% is a good rule of thumb. Consider bunching low-value items, such as old CDs, into lots of five or 10, or offer x-for-$y deals.
This is the best way to boost your earnings, as you have the most leverage at the moment that a company wants you but isn’t sure whether it can get you. Use that to your advantage in negotiations. Another benefit of getting a bump up when you switch jobs is that the percentage boost will be baked into all your future raises, elevating your lifetime earnings. Here’s how to negotiate your salary.

Posting ads on Craigslist is technically easy, but people often have fears about posting their personal information on the site. I communicate mostly through email when doing business on Craigslist, and I’ve never run into any issues. I’ve never been ripped off, nor have I been murdered or raped for using the site. It takes common sense, so use your best judgment, but don’t assume someone is a thief just because of their preferred communication method. For an extra bonus, google “funny Craigslist ads” to see some delightful examples of guerilla and grassroots marketing.
If I have a blog that is getting 100,000 page views a month that means that I’m probably getting at least 50,000 people to the site (most blogs will do between 1.2 to 1.4 pages per session). That means I have to try and get some small percentage of those people to buy something from me if I really want to do well. If I can’t get them to buy something then (in some cases) I have ads running on the site that will make me money anyways.
Great list! I’ve used Poshmark to sell clothes/accessories. You take up to 4 photos, add a description, and set a size, color, and brand. I’ve sold 3 items so far (two dresses and a pair of shoes) and it’s easy. The buyer can purchase at listing price or make you an offer, to which you can counter-offer. At all times, you can see what your profit will be from your listed price. Once the transaction is accepted, you are emailed a prepaid shipping label to print. You package your item up in a brown box and ship, and when the seller receives it your funds are released. You can cash out as a direct deposit to a bank account at any time or use the funds to shop. I’ve also purchased a pair of jeans on the site and they arrived as expected. For like-new and designer labels it’s a great way to clear your closet and make a little cash all at once.
Medium is an online community where anyone can post articles and essays and get them in front of their audience of millions of monthly readers. While it can be a great place to build your audience for your own blog or find customers for your consulting business, with Medium’s new Partner Program, you can now make money online whenever someone reads your articles. Register for free and you can choose whether your articles are freely available or only readable by those people paying $5/month for a premium Medium membership. You’ll make money based on the amount of people who read and engage with your posts each month.
Job Boards. When you’re first starting out, you’ll have to go looking for work, and the best place to do that is on one of the online job boards. Places like  Fiverr, Elance, Freelancer, and oDesk are today’s writers’ best friends. They allow individuals and businesses to post projects, and freelancers to bid on them. Take a look around the sites, sign up for the free access in the beginning, and then begin to place bids on the projects that interest you. It will take some trial and error to find your groove, but once you do, the jobs will start to roll in.
Use your skills to do day labor. Post an ad online or on a bulletin board offering to do odd jobs or sign up with an employment agency that specializes in temporary work. You can also go where other day laborers meet and wait for employers, such as building contractors, landscapers, homeowners and small business owners. Common odd jobs people need day laborers for include:[11]
Some companies like 1-800flowers.com outsource customer-service operations to third-party companies who then hire home-based workers or "agents" to take calls and orders. When you call 1-800-flowers, you may be speaking with Rebecca Dooley, a retired police officer and employee of Alpine Access, a major call-center service. When you dialed the number to 1-800-flowers, your call was automatically routed to Rebecca's spare bedroom in Colorado.
Websites like Care.com connect parents with babysitters. The company does all the background checking and other due diligence to put parents' minds at ease. Of course, you can appeal directly to people in your personal network, but if you're looking to generate recurring revenue sign up with a site marketing to parents looking for child care services.
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]
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