You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.
I recently gave some marketing tips to a bunch of local professional photographers who formed a company about 3 years ago. There are 7 of them and they were making around £400 a month (collectively). So I advised them to create a website, show their individual skills on the site, and start promoting themselves. (No no no, not the way you are already thinking!) The skills about their technical know-how, courses they can offer, and (very importantly) reviews of the latest equipment on the market.
Amazon makes it fairly easy to list and sell old books, games and devices on its marketplace. You can make more than just a few bucks If you have pricey textbooks from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart or games that are scratched up. Remember, be upfront about any defects, no matter how small they might be and no matter how few people might readily notice it. 
The list of options when it comes to making money via the internet is literally limitless. But just like making money offline, it is no easy feat. It also takes time, energy, planning and persistence to succeed. If you’re into affiliate marketing or blog advertising for instance, you need to gain trust from search engines to get your blog or website rank high in the search engine results, as well as gain trust from online users for better conversions.
I managed to make spare change selling my cards through these sites. The main reason I could make any money was because I would win cards in tournaments, hence I had a supply source that would result in a good profit margin. Of course this wasn’t sustainable unless I kept placing well in tournaments, nor was it really scalable unless I started buying in cards from other sources.

Like talking to people and helping walk them through problems? You can bring in extra income as a contract customer support superstar for companies all over the world. Due to the 24/7 nature of online businesses, companies are looking for people in different time zones to help deal with issues that their users are having. Better yet, if you have experience in service or retail you’ll be perfectly suited. Check out indeed or the other remote job boards I listed earlier to find opportunities.
Not only will this multiply the money you’re bringing in in a serious way, but it protects you against any sudden changes in the market or in your business. Remember that old saying about putting all your eggs in one basket? A few hours a week committed to just one or two of the following opportunities will put you in a much stronger position to be financially safe and independent.

Robo-advisors are diversified investment accounts that are automatically managed by a computer algorithm (as opposed to a human money manager). If you want to invest, but don’t have the money, or don’t want to invest with a money manager, robo-advisors are for you! Robo-advisors make investing easier—and cheaper—so they’re perfect for new investors.
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