The lie angle of a golf club is considered to be perfect for the golfer when the sole arrives at impact perfectly parallel to the ground.
If the lie angle is too upright for the golfer, such that the toe of the clubhead is tilted well up in relation to the heel, the face is automatically pointing to the hook side of the target line resulting in a pull.
If the lie angle is too flat for the golfer, such that the toe of the clubhead is tilted down in relation to the heel, the face is automatically pointing to the slice of the target line resulting in a push.
A Better Club will customize the lie angle that fits you.