You can always choose a perk as “charisma“? But you do not know why charisma? Then a small but informative cartoon from the creators fallout 4 tells why we need such a perk.
The high level of charisma allows you to establish contacts with the most malevolent inhabitants of the wasteland, it is advantageous to exchange and trade, as well as make new friends. But do not forget, alcohol temporarily reduces Charisma and then blame yourself.