What is the area you want to hit to get a strike?
That area is called the 'pocket'. For a left handed bowler that
curves the ball from the left side, the pocket is between the #s 1
and 2 pins. For a right handed bowler that curves the ball from the
right side, the pocket is between the #s 1 and 3 pins. For a bowler
of either hand that rolls the ball straight, either the 1/2 or the
1/3 pockets will do good.