Most Successful Exploits/Tools to use against windows & Linux?

[Pen Testee <pentestee@mac.com>]

I am just getting started with Pen Testing and there is soooo much information 
available. 
I am trying to get the most bang for my time spent in getting up to speed. 
What are the best exploits to start with so that I am likely to have the most 
success. 
I am looking for suggestions from both within a network and from an external 
test...please label internal or external when providing your response. 

What are the best links that list tools to use against exploits or exploits to 
try and tool to use. 
A chart would be ideal. 

Are there better cmd line? 

Thanks! 
On the hunt! 

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