What fingers should I use to play the guitar?

All five fingers of the left hand are used, the thumb is on the top, and the front ones are on the front, mainly according to the product, especially when the combination is announced. The right hand usually uses the thumb, forefinger and middle finger. When the right hand plucks the string downward, it uses the outside of the thumb. When plucking the string upward, it uses the inside of the forefinger and middle finger, and also uses the pick. Anyway, there are many techniques, so practice from the simplest and buy yourself a guitar book.