Backlinks can change the way of blogging. if quality backlinks can improve your blog ranking then bad and poor backlinks can ruin your all efforts and hardwork into vain.following ways are important for quality blog backlinks. -Blog Commenting -Use Forums -Guest Blogging -Internal Linking of Posts
I recommend you to be very careful with building links to your site or it will only cause you damage in the long run, make sure your links are only for good quality sites, do not spam links for no reason, do not put links on sites/blogs that are irrelavnt to you site nice. I would even recommend you to stay out of link-building nowdays if you don't have an expert to advice you. You can read an article we wrote for the community that might help you get the idea of one technique that should help you 'advertise' your site safely: http://www.websiteplanet.com/blog/how-to-build-a-contact-network-of-bloggers-for-link-building/
Another way is to get links from Squidoo and HubPages but you need to create authority and trust before your post links will be of DoFollow.