The hook is caused when the club face is looking to the left of the direction you are swinging
Heel shots are caused because you either move the center of your plane out towards the ball during your swing or you start too close to the ball at address
A tension filled grip, especially from having the shaft too much in your palms, will kill your entire swing. It stops your wrists from hinging naturally and then works its way up your arms and into your shoulders and locks up your entire swing.