Recommendations Needed For Learning More about the iPad

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I'd like to become completely familiar with all aspects of Settings.

I find the iPad User Guide for iOS 6 quite limited.

I'm currently studying
Safari Features in Apple.com
The iCloud.com help section
A haphazard collection of iPadForum posts and Internet sources

I'd like sources of information that would answer such questions as the difference between "Remove All Website Data" and "Clear Cookies and Data." (Some of the answers I've found are inconsistent or simply not all that clear.)

Does anyone know of any more intermediate level iPad user guides, websites, and ebooks?

I'm an academic, but I can understand a few lines in a Diagnostics & Usage data file