Are you new to shooting pistols? The way you hold your gun is extremely important. For example, ff there is too much of a gap between the gun and the space between your thumb and index finger, then your gun will not shoot straight. It will move around in your hand as you pull the trigger.
There are many little tips and pointers on how to hold your gun correctly, in order to shoot more accurately.
In the video below, Kay Miculek gives a demonstration for beginners on how to properly grip a pistol. Kay is the head instructor at Babes with Bullets Ladies Action Shooting Camps, and is also a World Champion Target Shooter.