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I have read Brian Greene's book "The Elegant Universe" as well as a few other books and I have a fairly decent understanding of the Concepts of string theory, and I would like to start learning the actual physics and math behind it.

Could someone please point me in the right direction.

I would prefer an online source so that I don't have to actually purchase anything and I can begin right away.

Yes, I have searched on google, but all I could find is sites that assume you already know the basic equations or sites that simply describe the concepts (which I have read numerous times) I am looking for something that will give a beginners lecture on how to derive the approximate equations and apply them.