Who knows how to do back linking and SEO?Help...

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I been surfing the net quite sometime. I happen toencounter thisterm SEO. What do you mean by this?Its kinda in demand now. Whoknows how to do it. Iam kinda interested with the way it works and it pays a good amount too. The probelem is, I dont knowhow it works.Who can give a How to site that provides ways on how this stuffs work?