"find a mechanic you can trust."
Reminds me of something Benjamin Franklin said, that any three men can keep a secret as long as two of them are dead. So any dead mechanic should be trustworthy, although, I'd still have reservations about some of them.
I don't think you'd find engine courses in Community Colleges. In high school trade programs, yes. In "Trade Schools", yes. And some adult ed classes, like the New York State BOCES programs.
Just a guess. I took night courses in welding at the local high school shop. If the OP does a search, he can probably find a course. If he has basic mechanical knowledge & basic tool skills & a good shop manual, he should be OK.
But with a lot of the trade schools, the problem is that they are "student loan" mills, set up to take in anyone who is interested, get them signed up for government student loans, and then no one really pays a lot of attention to anything beyond getting those loan dollars. Sad to say, but a long-term racket.
Interesting, I didn't know that
Asking a local car dealer's shop manager might get you a local referral, if there was one.
A good manual, and some you-tube videos, might be just as reliable a way to start.
I forgot about you tube, right, I have seen some of those, like how to time a VW diesel, something I have done many times. Brought back some memories.
It is absolutely amazing what you can find on the internet.