Welcome to the club of not being satisfied with understanding cars
just from a user standpoint. Work safe, learn more every chance you
get, and keep at it.

And don't forget to nose around down there with a flashlight when
changing the oil and look for trouble that hasn't happened yet. That's
the main reason I change my own oil, aside from knowing the work was
done right; I can see little problems in the comfort of my own
driveway before they turn into big expensive trip-interrupting ones.
Look around and just absorb what things are supposed to look like on
your particular ca, and as you go on, take notice of changes and ask
yourself what they mean.

Best of luck,
--Joe