With sites like Wrapify and StickerRide, you can earn hundreds of dollars each month by simply driving around town. You’ll need to place an advertisement on your car and drive a certain number of miles every month. If you’re already on the road for work, travel, or school, advertising allows you to make extra cash without any extra time commitment.
3d printing is a booming industry right now.  3d printers are machines that start with a chunk of plastic and essentially cut out whatever you design on the computer.  You can make clothing, jewelry, technology accessories, all kinds of things.  Writing a blog about what can be made with 3d printers, reviewing the best 3d printers, and having info on making the best designs would be AWESOME!  I might even follow this kind of blog even though I don’t have a 3d printer, just because I want to get one so bad!
Create and monetize an app. Mobile applications are a large and still-growing market that can provide you with a large amount of income if you know how to capitalize on it. The first and most challenging step, however, is creating an app that people actually want to use. Try to assess the need for an app by thinking of useful apps you would want or problems that can be solved by an app. Then, look for current apps that met these needs. If they aren't any, or if they aren't any quality ones, consider creating your own app.
Codecademy is great for taking you through the basics of HTML and it really guides you through and holds your hand when you are starting out and code just seems confusing. Often free learning is okay but not the same quality you would get if you paid for it, but Codecademy is genuinely really useful and rivals paid tools for functionality. It does much more than just HTML, so if you want to take it further you can learn CSS, JavaScript and even PHP, Python and Ruby if you want.
Obviously with such a hugely valuable niche where people will be spending on average around $30,000 to $60,000 on a boat, there will be tons of information and reviews available, right?  Wrong!  In fact, MOST of the boats that I was interested in had zero reviews to be found anywhere on the internet.  Zero.  And all the manufacturers showed was a few pictures, sometimes a sales video, and an abbreviated spec sheet.  That’s it.  I scoured the internet for unbiased reviews of boats and did not find anything helpful at all. 
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