To start a blog for free is building a house on a rent land, however there a tons of people doing blogging on free platform and earning a lots of money. Here In this tutorial I will point out some of the free platform where you can start free blogging and earn some money.
Blogger: It is one of the most popular blogging platform. Here they will give you a free sub domain and unlimited hosting. Also if your blog becomes popular you will be able to earn a from adsense program.
Wordpress: This is another free platform to start a new blog. It is actually wordpress.com. Visit here and sign up for you blog free. Wordpress is also more flexible than blogger.
Tumblr: It is similar like blogger also free to use.
Wix: This platform is similar to wordpress. Sign up here and start you blog free. They offer a lots of free theme.
There are some other platform that offer free blogging, but there are the most popular platform.