Target Practice is a gear perk that raises your damage when aiming down sights but lowers your hip-fire damage. It suits careful shooters who aim every shot.
Shots fired while aiming down sights do more damage. Shots fired from the hip do less.
Wear the Adventurer's Vest in the chest slot. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Good for rifles and precise play. Skip it if you fight up close with shotguns or SMGs fired from the hip.