When you play a guitar, you will have to know how to pick a guitar and these are some of them.
There is the standard style of picking a guitar. The standard style is holding the pick between the flat of the thumb and the side of the index finger with your fingers either anchored on or draped across the pick guard.
This style does have some disadvantages. You will find that pressing the thumb against the side of the finger to be an uncomfortable position. You will also find that if you dont press hard enough, the pick will become unsteady when you pick the string. You will find that the pick will catch on the strings.
There is a variation of the standard style where the remaining fingers are in a loose or tight fist. There should be no contact between the hand and the guitar except through the pick. The advantage of this standard style variation is that you should have less baggage to swing around. This is because the mass of the fingers are closer to the axis of the wrist.
The main disadvantage of this variation is that even in the greatest of players, they were inconsistent in the accuracy of their playing. They kept on losing on losing their point...