Where to learn advanced PPC strategies?

I know the basics. Ad grouping, page optimzing and click bidding. But where can I find even more advanced information that will go deeper in how to optimize your page for a high quality score and how to perform advanced keyword research ultimately bringing a higher ROI?

 

Try Perry Marshall's PPC training guide.

 

this forum is also not bad to learn PPC, especially Adwords section.
Check wickedfire forum too, I like redflymarketing blog also