The answer, at its basis, is largely what I convey in a great majority of my books about search engine optimization and online marketing. It all boils down to one simple concept: add tremendous amounts of value to the world. The more value you add, the more successful you become. Essentially, you have to do the most amount of work (initially at least) for the least return. Not the other way around.
ClickWorker is an online platform where you can get paid for writing, translating, researching and collecting data. To get started, create an account, fill out your profile, complete a qualification assessment, then bid on jobs. Payments are made by SEPA bank account transfers, and via PayPal once your account reaches $1.00, and your tax information has been completed. ClickWorker’s clients include Groupon, Tennis Point, Honda, PayPal among others.
Depending on your skill set, you could easily make a few hundred dollars or even a few extra thousand per month. And if you have some money to invest, you could easily launch into a variety of day trading activities. Those present some risks of your original capital. But if you know what you're doing and you work to hedge your bets by placing stops and limits, you could create sizable upside with lower-than-usual risks.