You can't reason with Imperial troops; they won't listen to you when you try to convince them that dominating the galaxy is just plain wrong. And smugglers only care about getting to their next delivery. So you need some sturdy weapons to do the talking for you; a blaster is the universal communicator. And of course you can't use the weapons without something to fuel them. Thus knowledge of the weapons and ammunition at your disposal is a definite must when taking on the Empire.
A lot of this information is from common knowledge on Star Wars, some comes from hearsay and some of it is off the top of my head. If I made a blatant error with the information let me know so I can correct it. But it should be accurate.