Now you could read forever on how to win a fight
and you could take lessons in the same way, but the easiest thing is to avoid
Now it may seem cheesy like you've heard it all before but there are some good ways
to avoid fights:
Talk it out- If you have no hope of winning a fight a good idea is to
talk with the bullies cronies as the bully most likely won't have any of it.
Friends- Most people hate bullies even people who are bigger than them
because there will always be someone bigger than you that also applies to the bully.
Heck you can even get big guys to teach you stuff about fighting and people older than you
usually like someone they can look after because it makes them feel wanted.