If you want to be able to execute a straight golf swing you should understand how bone alignment impacts ball flight.
Therefore, if you wish to execute a straight golf swing directly in line with your target, the following bone alignments must exist when the face of your club contacts your ball at impact.
FIRST: Your elbow bones must be aligned parallel with your shoulder bones at impact.
The relationship between your elbow line (the imaginary line that runs across your elbow bones) and your shoulder line must be parallel with each other at impact in order to hit a straight golf ball.
The shoulder line is the imaginary line that runs across your shoulders.
SECOND: Your wrist bones must be aligned to unhinge squarely to your ball at impact.
The alignment of your wrist bones determines the alignment of your clubface.
When your wrist bones are aligned to hinge and unhinge perpendicularly to the tip-end of you right shoulder it will indicate a square alignment of your clubface.
If so aligned at the point of impact with your ball, the clubface will contact the ball squarely during the downswing, a necessity if you wish to hit your ball on a straight path in line with your target.
THIRD: Your shoulder bones (shoulder line) must be aligned parallel with your target line at impact.
Not only must your elbow line be parallel with your shoulder line when your clubface contacts your ball at impact in order to hit your ball straight, so must your shoulder line be parallel with your target line when your clubface contacts your ball at impact in order to hit your ball on a straight path in the direction of your target. The target line is the imaginary line that runs from the target back to and through the ball.
FOURTH: The mid-point of your shoulder bones (the center of your clavicle bone) must be aligned squarely perpendicularly to the back of your ball at impact to produce a straight golf shot.
This is the point the arc of the golf swing must bottom-out during the downswing in order to hit a golf shot on a straight path in the direction of the target.
The only golf method that locks-in these four bone alignments during the setup proceedings and keeps them locked-in during the remainder of the setup routine and golf swing are the Locked-In Golf Techniques™ discussed in such instructional books as How To Lock-In A Perfect Golf Swing and How To Hit A Golf Ball as Straight-As-An-Arrow, both of which are available at LockedInGolf.com.
Once you are able to perform any of the Locked-In Golf Techniques™ addressed in these and other books, you will be able to lock-in a straight golf ball alignment during your setup proceedings, execute a straight golf swing and hit your ball as straight-as-an-arrow to your target.