how to build one way back links for free

This is very easy to bring one way free backlinks to your blog or your website and this is free as well. The way is that you comment in the blogs. First just search for the dofollow blogs. There are many blogs in the internet with dofollow with high page ranks and you can get to them very easily with a little search in Google. Get to them and comment. Be sure that you comment reasonable so that your comments gets approved.