I. Don't. Think. So.
More trial and error, than anything else. Then you're supposed to remember what actions you took to do what you wanted to do and get where you wanted to go. Does this make any sense?
I am learning. My head hurts. The phone rang for the first time today and I tapped the phone icon - nothing happened - tapped twice, and nothing. The caller finally hung-up. I learned later that to answer a call one must 'swype' the icon across the screen from left to the right. Who knew?
Similar steps are true with the Kindle Fire. With a few differences - swiping is done from right to left. Why? Dunno. At least the manufacturers made an attempt to simplify and standardize as many procedures as possible without infringing on whatever patents were involved.
Am I just an elder sage trying to rationalize my own ignorance, or is there some merit to my explanation? Dunno. My head hurts.
And so it goes.