How to improve the Page rank of a site?

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Using SEO techniques.
1.Onpage SEO.
2.Offpage SEO.
In the onpage SEO we links our site in the coding of a website, And we concentrate on meta keyword,meta tag, robots follow and content.
In Offpage SEO we work separately from the web site.
There are basic concept which are used in offpage are as follows:
1.Directory Submission
2.Blog Submission
3.Article Submission
4.Forum Posting
5.Press Relies
6.social bookmarking etc.