^^^ Don't mean to be rude pantin, but that isnt really a very good explanation to someone who is obviously new to the game.
The nuts is when you have the best possible hand at the time. So if you hold 6,7 and the board is 4,5,8,k,q. You have the best possible hand with the straight, so you have the nuts. If you have the k,q of diamonds, and the flop is 2,6,t of diamonds. You have the second nuts, because if someone had the ace of diamonds and another diamond, they would have the nuts.
I hope that makes sense