High school fight. Need tips and technique help?

when it comes to fight science it all about superior angle and position, its most natural to mirror your opponents moves like he step forward you would take a step back,no. if you both just come in straight at eachother your just gonna be showing each other your guard or there will be sort of a rock paper sciccors effect of hit and miss, so if you both put your left arm forward when he steps forward step to his right and youll notice youve worked around his guard where you can drill him right in the nose with a rear cross