its a a most frequently asked question from most internet users.for internet user its a dream to earn money online.i have too.
by search on internet i found that there are saveral ways for earning online like online surveys,writing sites,by receive paid email,ads on your site.
receiving paid email site rupeemail.
for writing sites are mylot,squidoo,hubpages etc.
but in earning online user must ensure that site is genuine and paid.
The best genuine way is if you have a site than connect site with ebay,google adsence etc.