Hi Damon,
When I was young I did a 36 week night school course on car maintenance.
I learned how to de-coke a car engine, how to replace brake drums and shoes, the innermost working of Carburettors, chaining spark plugs and points, repairing a distributor, and more or less all of the electrical bits -- not many then --.
I serviced our cars until company cars came along, & although I still serviced my wife car for years the changes in technology meant either a very complicated apprenticeship or paying a good mechanic to do it for you.
I check the fluids, and things like air filters, but all these sensors are something different, so I leave it to the experts.
Regards,
Peter.