I never cease to be amazed how unlike Windows often, at the massive amount of free and apparently safe Apps available for Android Tablets. However the one thing I do find difficult is finding any help such as on all the functions of many of these Apps. For example I was obliged to install an App to use the camera for photos and another for videos on my refurbished Nexus 7. But there seems no way of knowing the purpose of all the little icons that quickly vanish after awhile. Is there a URL link to somewhere we can download such info on any of the Google etc. apps please?