Have you ever had your car just "die" on you, you strive to begin it and it just will not begin. You end up calling a tow truck and paying those enormous tow bills, then to make matters worse the technician at the shop tells you that it will cost hundreds of dollars to make it run again,is that true? Maybe maybe not.
I own and work as a diagnostics Tech here at Ace Automotive in Lakewood Wa and I can tell you from experience if some people knew just a small more about their cars workings they could save a whole lotta cash. Say for example you are driving at night-moment wipers and heater ,lights and radio on you notice that the headlights keep getting dimmer and dimmer soon the car "dies" and now won't begin the most likely cause is the alternator has failed, not the battery because if the battery failed the alternator would still keep energy to the car until you turned it off then it would not restart.
You are driving for a while and the car just "shuts off" all the instrument lights come on but when you strive to begin it it just turns over but will not begin. First it depends what kind of car this happened to if it was an import like say Honda, acura, toyota, subaru, nissan, mitubishi, the motor timing belt may have broken (if it's been more that 60,000 miles since you changed it last moment) you should be able to tell if when you strive to begin the motor it sounds disparate like its just "freewheeling" faster than normal, this is evil cause most of the import cars mentioned will do extortionate harm to the motor when the timing belt breaks.
If your car is a domestic one chevy ford etc, be patient wait a small bit maybe 30-45 min and strive to begin it if it starts hurray! But it will "die" again once it's hot enough again, be sure to tell your local tech this priceless information and question for all parts they replace to mend your car to let them know you know something about the car too.