Earn money from blog is very unique way among all the ways to earn money part time.
Online users can write blogs and take advertisement on those blogs from different ad networks and they can get paid on every click on the ads on their blogs by users or readers of the blogs.
People can take ads from google adsense kind of ad networks and they can make money from blogging.
If we see the top 10 bloggers, then we find that they are making very big monthly income by blog writing only.