And other job of mechanics is to find what's actually wrong with the vehicle in case for break down of vehicle and then fix that issue.
What's actually wrong means some time customer comes and they tell my AC is not working. So mechanic's first job is to find out what's wrong with AC system. Like is the compressor bad or pump is bad etc.
I think in most of the community colleges in USA there are 2 year associated degree in automotive mechanic is available. And as per my knowledge there are may be more than two specializations. One is just to understand the mechanical aspects and other one is to learn the electric aspects of vehicles and some others.
But as the Electric Vehicles are becoming popular day by day. So I can say Electric specialized program would be more beneficial in coming future.
Here is the link of reference of course