There are millions of different street fights mate. In the main, there are three basic types.
1 - Square go. This is where you and someone else, for whatever reason, agree to have a fight. You're both a pair of arse holes if you do, unless you ahve a very good reason. Ego control, verbal de-escalation sills etc. become as relevant as any fighting technique here.
2 - Ambush attack. Someone has picked you out as a victim and pounces when you are not ready. Thee are ways to massively improve awareness and avoidance strategies to "target harden" yourself.
3 - Interview. Here you are in a worsening verbal confrontaiton. It is obviously leading to a physical fight. With good skills from "the Fence" ( see
www.geoffthompson.com ) you can hit him first and win before he knew the fight has started. Obviously this is only if you cannot de-escalate things in any other way.
99% of fighting arts train for number 1 only. And most of them don't even do that very well. Research Geoff, and research
www.senshido.com also. When I did I felt like a veil was being lifted, and my previous two dimensional, black and white knowledge went into full wide screen technicolour!