There are many facilities all over the country that will charge you a great deal of money to teach you these things. Some of them are the real deal, some of them are full of crap.

You never know which is which until you attend.

Assuming someone would know how to utilize a firearm in any practical sense without a great deal of training is no good. It doesn't. However a good deal of people that enjoy shooting do attend these sorts of things all over the country all the time and learn to deal with a variety of situations that are defensive.

It's very similar to martial arts in that sense.