Help for beginner

hi everybody ,
I am not new to networking and I need to get into the world of data center networking (nexus and so on...)
I am in need of some guide , where to start , what to study and focus on  in terms of products & technology , design and implementation.
if you could also provide links to helpful stuff that would be great
many thanks

Here is one link and hope it helps.
http://www.cisco.com/en/US/products/ps9670/products_implementation_design_guides_list.html

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