OFF page strategies such as forum posting, bookmarking, blog comment, classified submission, web 2.0 promotion will help to increase your backlinks. Priorities to the websites which are having good domain authority for link building.
Use given bellow techniques to increase your quality backlinks
.social bookmarking
.Forum posting
.QnA
.Blog commenting
.Web2.0
.Article submission
.Blogging
SEO off page techniques are best source of backlink. Link building basically means creating backlinks to your website. Off page seo are best techniques of link building like blog comment, forum posting, classified, article posting, blog posting.
For improve backlinks we are doing off page activity.
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Forum posting, social bookmarking, document sharing, ppt sharing, pdf sharing, article submission, Q&A and press release etc.