Search for relevant sites which sites have high pr and alexa with pa/da.

There are a variety of ways on how to gain backlinks and off-page SEO and link building techniques:
1. Social Bookmarking (easiest way)
2. Social Networking Sites
3. Forum Posting (I suggest post on dofollow sites)
4. Guest Posting
5. Press Release Sites
6. Article submission directories and blog sites

Thanks for share..
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First quality backlinks is necessary for seo. so use offpage optimization techniques like dir submission, bookmarking, article, forum posting.

I agree with you

1 Social bookmarking
2 Forum posting
3 Image backlinks
4 Infographics

;) ;)