if your attacker is male, go for his junk - especially if he’s wearing loose pants. There’s no sportsmanship when it comes to assault so fuck them balls UP
punching pretty much ANYWHERE in the face is going to actually hurt you a LOT (just think - you’re punching your bones into their bones and ow). If you’re going for the face, my suggestion is to strick upwards with your palm.
see that meaty portion highlighted in red? There’s a lot of muscle and fat right there which makes it excellent for striking. Hold your hand as shown and aim for the nose or chin (though I’ve been told in extreme circumstances, doing this to the nose can be fatal but I’ve never really heard if this is true or not) and just aim upwards
the shin (hurts like a bitch if you kick it right - also, you can hit this spot if you’re being held in a choke-hold and if your attacker has to move in order to stop you from kicking him, he’ll have to angle his body so as to expose his stomach and crotch to the wild spastic jabbings of your elbows)
the solar plexus (either jab while holding your hand in a sort of spear position or use your elbows - unless you’re super strong, your punch probably won’t wind your attacker. Your elbow or a spear hand will, however)
Originally in (most) martial arts, you hit the solar plexus because it supposedly contained an important chakra. Now we know that it actually also contains like a bunch of necessary organs that are exposed just below your ribs and is also (roughly) where your diaphragm lives so getting punched there is not pleasant.
the clavicle (from experience, getting hit in your clavicle HURTS LIKE A MOTHERFUCKER. If you strike downwards with your knuckles, the person might just cry. Like I did.)
the ear (this is probably the best place to punch besides the throat. It’s all cartilage so it probably won’t hurt you all that much and most people will be like “DUDE YOU PUNCHED ME IN THE EAR WHAT THE HELL”)
the kidneys (this is harder to hit without training but if you somehow get your attacker’s back to face you, try to hit’em in the kidneys. Again, from experience, this FUCKING HURTS. You can’t really hit the kidneys from the front with any effect but from the back it is super painful)
if you’re held in a choke-hold, try turning your head so the forearm isn’t pressed into your throat. If you can position yourself right, you can sort of force your chin into the crook of the elbow, making you able to still receive (limited) oxygen and provide time for you to kick some shins or elbow some spleens and shit