A pulled golf shot is a shot that flies straight left of the target.
A pull happens when the direction that the club head is moving in is to the left of the target line immediately following impact, with the club face aiming in the direction that the club head is moving. A pull is a straight shot but to the left instead of at the target.
To correct a pulled golf shot, you simply need to swing the club head along the target line immediately following impact and keep the club face aiming down the target line as you do this. To help you do this, place a head cover to the left of the golf ball and on the inside, or your side of the target line. Put the head cover about one foot left of the golf ball and just inside the target line so that the club head can move along the target line but only just miss the head cover. Make a swing and as you swing through impact, work on swinging the club head past the head cover on the far side of it, keeping the club face aiming at the target as you do this.
If you find that you are struggling to miss the head cover then place a range basket on the right hand side of the golf ball. Place it two feet to the right of the ball and just on the far side, or the outside, of the target line, so that you can move your club head away from the ball just on the inside of the basket. As you swing the golf club, work on keeping the club head on the inside of the basket and do not let the club head hit the basket. This will now result in the club head approaching the ball from along the target line and make it easier for you to keep swinging the club head along the target line, rather than to the left of it.
Doing this will get you hitting straight golf shots and if you are missing the head cover you will now see that your golf shots are flying straight at the target, rather than missing it on the left.