As a newcomer to DnD, I am a bit confused about the attack rolls.
Say I am playing a rogue with Sneak Attack, and an offhanded shortsword (shortsword mainhand)
So I first roll an attack roll to determine the hit, and if I get a roll+mod equal or higher than the target AC, I attack.
I roll 2d6+3 and then a 2d6.
My question is, do I have to roll an attack roll before each 1d6? Or is one attack roll suffices?