It all started when Peter Parker was in school, his class went for a field trip and during that field trip he got bitten by a radioactive spider so when he got home he slept and the powers started growing and naturalizing and when he woke up he started seeing without glasses.
So Peter went back to school for his second class and found out that he had super strength, webs on his hand and then he could climb walls. At he end of the class he went outside to test them. He climbed walls, then he spot out a web and he swung. So in the night he went with uncle Ben and lied that he was buying some things meanwhile he went for a wrestling match. So after he came back he found his uncle dead and decided to catch the person and avenge his death.
So peter becomes spider-man who fights crimes and saves the day