Free Directory Submission, Link Building or building back links plays a major role in search engine optimization, getting a higher search engine ranking positions and a higher page rank
Link Building Archive
Another few methods that can be used to build one way back links to your site are submitting your articles with your link in them to article directories ..
Now just set up Google alerts for each of your keywords for which you want to build one way back links. Do not forget to set the “type to blogs”