the damage system:
the first number is how many dice there are, the "d" is there pretty much just to seperate the numbers, and the second number is how many sides each die has. a few examples-4d4=4 dice, each with 4 sides-3d6=3 dice, each with 6 sides. the sum of all the dice are added up and then modified by your stats and that is how much damage you do.