Here are Top 7 way to earn money online
An Example of blog is www.darksite.co.in itself.
2-ByDevelop application For Different Platform
Once Start your first app,Then you can start thinking of a unique game or app idea. Forget Angry birds, believe me, there are people who are earning loads of money from much simpler ideas. You can make a simple app too. It'll either be popular, or it won't. But in either case, you'll learn something, and that is why you'll always be the winner.
Popular smartphone platforms are Android and iOS. Even windows, Google is playing bunch of money to develop application and submit it to them :).
3-By Write Articles
Freelance writing is another great way of earning online. If you like writing, or if you are good at it, then you should consider this. Writing quality articles can earn you thousands of dollars per month. All you need to have is the right focus and of course, a good publishing platform where you can submit your articles.Be sure never to plagiarize. Unique and fresh content is appreciated, while plagiarism might result in a ban on you. So be original, and you will be fine.
example http://letterrep.com/write and submit article there.
4-By Playing Games Online (Testing/Reviewing)
There are few such sites that require you to signup (paid) which i don't feel is much practical for students, so instead they could op tin for just paid to play games. Where you get paid by simply playing number of hours on the site.
5-Earn Money online By Reporting Vulnerability On websites
you can report XSS, CSRF/XSRF, SQLi, Authentication bypass..etc many more or any new hack.when you report the vulnerability you will get reply from the website security team and bang you have earned huge money.
some site that provide this bounty program are
Example : One Of My Nice Friend/bro Harshavardhan(Earned Many Bounty Program)
So These are the few best way To earn money online. Later Also I am planning to post more on making money online Make Share and help other to earn money online :)