Forum Posting, Guest Blogging and Article Marketing are the best techniques to build quality backlinks. But you have to submit in your niche related websites.

By all the Off page and SMO activities

Need to build the back links to your site in a quality way are
Directory submission
Social bookmarking submission

The content need to be in a quality in a blog.

You can search subject of your site in google.com/blogsearch to find backlink sources

Search engine optimization technique is very good to get backlinks for your website.use various techniques like forum posts, social bookmarking, web 2.0 .these will help you to create more backlinks. And backlinks are good to get more visitors.

Just Follow these Rules
1. Comment on Dofollow Blogs related to your niche
2. Join Social Networking sites and make relation with other and share your latest post to there. comment on other blog on Social Networking sites.
3. Join Dofollow Forum like Site owner forum. add 2 links in signature will give you dofollow backlinks.