Where to start with SCCM2012

Hi All,

I have been working with SCCM 2008 and now 2012 for about 3 years now. Deploying desktops (thousands), creating device collections, packaging apps and deploying. Basically day to day stuff, but now I want to dig deeper and understand it better. I have gone through the setting up a lab process, which is up and running, but would like suggestions  / recommendations where I go from here. Any advise would be greatly appreciated

Thanks

Patrick