hmm, .the page is displaying oddly, I think I might have made a poll, nontheless.

I have downloaded bitcoin -qt, and even visited a few places was able to get a VERY small amount of coin in it. I am wondering however about the "address" or "keys" That are used.

can someone please explain in some detail the "public/private " keys situation, and what I need to back up in order to get my coins back if I lose my computer, and also, what key I share with others to get paid, and what key I use to pay others..

Sorry if it is kinda noobish, but I find that the information I was expecting to see in bitcoin -qt, is note really what I see.

THANKS!