If you want to clear some space out in your house and have a big stack of books you’ve been holding onto for too long, you can make money selling your books and textbooks online. Stores like Half Priced Books and others will give you cents on the dollar for each of your current books while you can check what your book is worth by simply entering the ISBN number on Book Scouter.

With the internet, you can reach a global or a local audience. There has never been a better time to start your own offline business, by promoting it online. Every offline business should be online, either with their own website or through social media. Preferably through a bunch of different methods. Online can really lead to a huge spike in sales.
If you have a fondness and talent for taking pictures you can make extra money online by becoming a stock photographer and selling your images to a stock photo company like ShutterStock or iStockPhoto. You’ll get royalties every time someone licenses an image you’ve submitted. To really be successful, build your own photography website to be able to showcase your portfolio and start getting higher-paid private corporate work.
Write pitches. If you have located a client for whom you want to write, send pitches, which are topic ideas for articles. Write pitches that not only show your expertise, but also demonstrate your enthusiasm for the topic.[21] First, read the publication to which you are sending pitches to familiarize yourself with what they publish. If applicable, identify a specific section and send our pitch to the appropriate editor. Also, include a brief summary of who you are.[22]

If you're looking to address some immediate financial needs, then the app economy is likely right for you. Thanks to the global sharing phenomenon, launched in part by our smartphones and ever-burgeoning global connectivity, you could easily opt for some quick active income by using well-known apps. From ride sharing to deliveries and even quick tasks, there's an app for that today, as the saying goes. 
6. IZEA – IZEA works in addition to a blog or on its own. You get paid to blog, tweet, take photos and take videos. The pay is mostly based on your following, so if you want to make money with your tweets, you’ll need to grow you Twitter following.  Likewise, if you want to make money with blogs, you’ll need substantial blog traffic (more on blogging below).
Otherwise, you can invest your money through online companies, but careful, it could be very risky. And depending on the products you chosse, you can lose evrything ;( Today, there are great startups which help individual to earn money through responsible investment. I do love the roboadvisors in USA or UK as : Betterment | Investing Made Bette, Motif - An Online Brokerage Built Around You , Sophisticated Investing Made Simpl . Online Investment Management | Investment Portfolio | ISAs | Pensions | Nutmeg , ect ( you can find hundreds) I do love as well this startup which helps people to find good and efficient algorithms : Quantopia
Just like you can turn a profit on sharing your skills online, you can also do so using your knowledge. There are a variety of sites out there that will pay you to do research, answer questions, or be an on-call expert in a number of different industries. Have a nursing degree? You can pick up some extra cash when you’re off duty by answering medically-related questions. Off-duty handyman or plumber? You can do the same thing with home improvement questions. If you just enjoy researching, you can pull in some cash by doing research through a website like Wonder.
28. Subscription – If you think of something valuable (newsletter, online magazine, etc.) that you can consistently offer on a certain basis (weekly, monthly, etc.), you may want to offer a subscription service. This could be a fee charged each time your product is sent out or on a monthly basis. Either way, this has to be something that your customers can only get by subscribing to your website.
When creating a membership site, always offer different plans and pricing tiers to appeal to your different categories of audience. Access to specific types of content is then dependent on the plan selected by a member. Membership fees can be a one-off payment or a repeat subscription. And you can even sell products on your membership site to boost your income.
A lot of people don’t realize this, but anyone can sell an ebook on the Amazon Kindle Store and elsewhere. It’s one of the single best ways to make money online and earn a residual income. There are many places you can sell an ebook online, but the Amazon Kindle Store is by far the most popular and it doesn’t look like that will change anytime soon.
InstaGC is a rewards site you can use to redeem instantly for Amazon gift codes (and all kinds of other gift codes). With this site, it's possible to earn money for doing all sorts of things which include short tasks, surveys, watching videos, listening to music, and more. What I love most about this one is that when you do redeem, there is NO waiting. You just ask for your code and it's there waiting for you on the next screen. It's also possible to request a check for a cash payment, but you will have to wait several days for that to show up in the mail.
This isn’t to scare you off. I simply want you to know that this guide is going to focus solely on ways to make real, sustainable extra income online. Not just a few bucks. I want to share all the mistakes I've made that got me to where I am now so that you don’t have to go through them, and can build a successful online source of income for yourself.

Once you have a product in mind outline how you plan to write it into a post. Unless you are a fashion blogger and you have pictures of yourself using or wearing the product that you are trying to sell it is pretty hard to just throw down a link and have people buy the product. Most people won’t buy a product unless you give them a reason to believe that it is worth it, so do just that. Outline a post where you can share the product plus explain how the product will help the people who read your post.

Consider selling in lots. A lot is a collection of similar items that is sold in a group. For example, if you have a collection of books, magazines or similar pieces of jewelry, consider selling them all at once in a lot. You many not make as much money as you would have if you sold each item separately. However, the items will likely sell more quickly in a lot than they would individually.[29]

Rather than making money through subscriptions, YouTube channels are based on a traditional advertising system. Meaning the more viewers you get, the more you make. Once you’re approved for the YouTube Partner Program and can start including ads on your videos, with every 1,000 views, you will make approximately $2-$4. Which might not seem like a lot, but if you have 100 videos with 5,000 views a month each, that would be $1,000–$2,000 already. Just imagine if your videos start hitting millions of views!
As you start regularly putting out content, you’ll hopefully start to build a bit of an audience. But to start seeing real money from YouTube you need to market your videos elsewhere. Share your channel on Twitter and Facebook. Distribute videos anywhere else you can think of. Also, interact with comments and build a community around the videos you’re making so people will share it with their friends.
Money makes the world go around and it is something you always want to have more of. Whether you are struggling to pay bills, want to save up for something special, or just want to have some extra fun money available, you do not need to go out and look for another job outside of the home to earn more. We live in an internet- and computer-based society, and that means there are more ways than ever to earn money online and from the comfort of your home. Work at home jobs are not just limited to customer service anymore.
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