Don't talk to strangers, try to keep a distance about out of comfortable indoor voice talk. If they're desperate or just don't like the colors you're wearing or think you're an easy mark talking is probably going to be the thing to set them off. If you get introduced from someone you know generally you don't have to expect outright violence from them but you have to suspect them both of doing something underhanded especially if you get a bad vibe from the one your not chummy with or your friend lives or is room mate with you.

Don't bother locking your car doors, if they want in they'll just smash their way in. Parking in a garage means they're way less likely to vandalize it for shits and giggles.

Know the layout of the places you go around possible short cuts, side streets, if their is a short cut between buildings never apartments if you can't help it, or if you're going down a dead end, sometimes areas just have no good options but generally go to one that's more open if possible that people can see it's not going to do shit if they've made up their mind already that they're going to make a move but it might if they haven't. Knowing where a rock bed is can be useful if you're certain something is about to happen and can't get away.

If you have a weapon you have to be 100% ready to use it, keep it concealed as possible the less people that know about it the better. Sometimes knowing you have a weapon will make people want to fight you, especially if they don't think you'll use it.

If they have a knife they'll want to put it to your throat so try to get a hold on your hair or the front of your shirt, although when I was growing up even unarmed people like to get a hold of something tore a lot of clothing sometimes stuff that isn't well made can be sort of handy if you know it'll rip in the scuffle at least it did for me. Chains are surprisingly common had two guys walking behind me the other day heard one drop/drag a heavy chain on the ground I've had people come at me with those before.

Generally just don't stop moving, stay alert listen/watch out for stuff. A few things off the top of my head, when you grow up in one of those areas it takes a lot of life experience to learn this behavior and stuff isn't normal but the people around you are use to it being the norm so they don't really see any of it as a problem and usually have a very false sense of security until things take a turn for the worse. So sometimes you have to use common sense ahead of time and think things over before you act like doing something that dulls your senses such as drinking, don't use it as a get to know you activity only do that sort of stuff once you know someone pretty well and not around strangers to you, they might be your friends friend but that doesn't mean they're not a stranger.