Posting on relavant sites ( Blogs, Forums, Directories etc ) is the best way to get beneficial backlinks. Always try to get dofollow links on high PR sites.

Create unique articles that people are eager to share. Leave comments on blogs and websites in your niche, sign up on forums, and help other users find answers to their questions. Focus on article marketing. Write guest posts on other people's blogs in order to get quality backlinks to your site. You can also use social media sites to build links and improve brand visibility.