u/itzitachikun

I have a fight on monday with a guy. and its bound to happen theres no pulling back. see im like a teen and like im pretty strong for my age. hes also pretty strong like a few years back he used to be much stronger than me but now i grew much stronger than him. thing is i dont really fight much and like im really strong for my age but what do i do in a fight without knocking him out or killing hm? i don't wanna seriously injurie. what do i can please give advice