First off, I am no plumber, so sorry if these question are something assumed to be known information.
1. In steps 8 and 9 it says to install the tank bolts when you install the tank to the bottom using only one nut per bolt. My assembly instructions tell me to install the bolts to the tank with a nut and the the tank to the bottom with a second nut. Can you clear this up for me?

2 In the next post by Terry it says under the wax ring picture "Notice that the bag of bolts includes four nuts and four washers." My floor mounting kit only came with two bolts, two nuts, two plastic washers and two metal washers. What is the second set of nuts for in the one you have pictured?