[sarciszewski]

I should probably have specified: I don't represent Matasano / NCC Group in any way shape or form.

That said, I don't think you do. Your question is somewhat like asking if you need to study every medical specialty to the bleeding edge of research to become a general practitioner.

No, but any of them you master will definitely be a boon. :)

[abdelhadikhiati]

Thank you ,actually i was addressing the one from Matasano who responded on your comment , Your advice is very helpful sir , thanks again .