 The fret/position where the first finger of the left hand is placed on the fingerboard is usually not systematically indicated, but when necessary (mostly in the case of the execution of "barrés") indicated with Roman numerals corresponding to the fret number from the string nut (which has no numeral) towards the bridge.Placing the right hand on the strings

If you look at the fingers, you will notice that the index finger is shorter than the middle finger.If you place a pencil across the fingertips, you will see a diagonal line.