Beware of what some instructors tell you...
Recently I was in a major sports store's golf department to try out a demo driver against their simulator machine. Before I could even take a swing, the so-called pro was trying to adjust my grip. Rather than argue with him, just for the heck of it I went along with his suggestions, and have come to the conclusion that some instructors think that any suggestion applies to all golfers, and we students must be identical robots who should all function the same. The guy told me that my right hand was in too strong a position and that would cause shots to go to the right, and that point was not even up for discussion. Now since I am a certified instructor, I already know that the opposite is true, a stronger right hand position will send the ball left, not right. So I followed his suggestion to try a weaker right hand and sure enough the ball went way right, and I tried to explain to him why, but he just got mad. Then with my stronger right hand position, the shots went straighter and he got even madder.
The bottom line is that we are all built differently. There are hundreds of small muscles and hinges working in tandem to make a golf swing, and none of these muscles and hinges behave the same way from person to person, just like fingerprints being different. In my case I need a stronger grip to make the ball go straighter, maybe not the case for other people. Some self righteous instructors do not seem to realize that, so be careful not to take everything they say as gospel.