Do you know how to work on cars?
No but I have a close friend who does
Have they ever helped you with your car if it's been broken?
Yes they have they are called auto mechanic (automotive technician in most of North America, car mechanic in British English, and motor mechanic in Australian 
That's good to know, thank you. I should learn how to work on my car more but all I can do is change the oil.
Wow, their main role is to diagnose the problem accurately and quickly.
UTI is a technical college for auto mechanics in Florida, I've known a few mechanics that have attended that school. 
Wow,  Basic vehicle maintenance is a fundamental part of a mechanic's work in modern industrialized countries