The grip is the most important part of the golf swing and the most neglected. With a good grip the club face will be in the correct position at the top of the backswing and in the correct position at impact allowing the arms and hands to crossover. If you have a bad grip you then have to make accommodations in your swing to adjust for this flaw making it more difficult to execute the swing. With a good grip your game will continue to improve with practice.
There are three grips used: The full finger grip, the overlap and the interlock. The only thing that changes in the three grips is the position of the pinky finger and not the position of the hands which remain the same in all the grips. It does not matter which grip is used as long as the hands are correct.
The club is to be held as soft as possible. When teaching I often refer to it as holding a wounded bird. The reasons for the tacky grips are that you don’t have to hold the club tightly and if the grips are not tacky and have some shine, get new grips. I should be able to pull the club from your hands with little to no effort.