I think we should not buy backlink.if google is detected, it will be punished severely

wow thanks for share

Hahaha good backlick is the natural backlink :)

you can get quality backlink by bookmarking,directory submission

You can post your links in various type of sites which give you back links. Back links are very essential for ranking of your website. You need to select best sites.

And there are so many links and directories, that you surely dont have enough time to do them all! :)

Quality back links are those that are placed on high ranked sites that contain daily traffic whether they are social networking sites, forums, article submission or bookmarking sites.

You have to find forum which are do-follow.

To obtain good quality backlinks, you need to focus on the quality content while making backlinks for your website. Search engines hates the copied or duplicate content it adversely affect your website ranking among the search engines.

Quality backlinks are those who are having keyword relevant content