Boo your biggest learning tol is right in front of you ...THE COMPUTER.....
you can just about learn vast amounts of information on all the questions you are asking and way beyond that with the touch of a keystroke on your PC........pictures, text, opinions, reviews, demos, on any topic or item available to mankind....you just have to take the time to find it, research, and make a sensible decision thats just RIGHT FOR YOU....!
its not Rocket Science

good luck