I've been using an iPad since they first came out, and I knew that there were many useful features that I'm not taking advantage of. But I'm now remedying that, thanks to a free tutorial available in the Mac App Store called SCOTutor and put out by ScreenCastsOnline. Unfortunately, it's only available for Macs. The app is a video tutorial showing all facets of the iPad. It has 24 chapters, such that you can quickly jump ahead to any chapter or subsection of a chapter. I immediately went to the chapter on using the home button and using gestures. I was surprised that I could simply use a four-finger swipe up to reveal the multitasking bar. And that by swiping horizontally with four fingers I can navigate among the open apps in the multitasking bar. And I learned that a five-finger pinch is a quick way of getting back to the home screen. I was also surprised that Safari on the iPad has the same Reader feature that I often use on my Mac. I had never noticed it. This is going to come in very handy. It simplifies a web page so that you can read an article without all the distracting ad content and links and other stuff around the periphery.
I highly recommend this tuturial.