If you really want to learn some of this, I recommend two books:

"Jiu Jitsu Complete" by Kaose Nake (old, excellent, and I've spelt his name wrong)

"Get Tough! How to win in hand-to-hand fighting...." by Captain W. E. Fairbairn (yes, THAT Fairbairn). Originally published for the British Armed Forces in 1942, my copy is by Paladin Press, 1979.

Remember, you didn't start the fight, you didn't want the fight. Therefore, you will win the fight and you will do so by using extreme violence. And remember -- ANYTHING can be used as a weapon.

Even better than fighting is leaving or, best of all, not being there in the first place!