At random when you visit websites such as TOI, News Portal or listing websites, you will often find pop-ups or feeds such as “This girl from Delhi makes 6000/- rupees every day, click here to find out how.” Honestly, these are all crap ads. However, there are few serious websites below where you can make not only 50k, but more than that. It totally depends on your skills and the demand of the consumers. You can also make money if you have interesting contents via YouTube or via blogging, however, that takes a toll of hard work and constant optimization. Here are few links of genuine websites, where you can register and actually find authentic job and learn how to make 50k per month for free.
Amazon Mechanical Turk
mTurk is a marketplace where freelancers and developers can do the work posted by businesses.
oDesk helps connect individual developers and freelancers with small businesses
Scripted is a network for freelance writers where website owners post their content requirements.
Fiverr has been a big hit with people who work from home as it offers flexibility of work hours and the tasks take less time to conclude.
It is considered to be the largest online site for making money online.
I hope this helps!