You are proficient with using this select type of weapon.
Benefit(s): You make attack rolls with the weapon normally.
Normal: A character who uses a weapon with which he is not proficient takes a –4 penalty on attack rolls.
The types of weapons one can take Weapon Proficiency in are as follows: Simple, Sword, Polearm, Axe, Hammer, Bow, Pistol, Rifle, Shotgun, Lightsabers. Exotic weapons require you to choose a single exotic weapon.