Excellent channels for learning how to properly diagnose car problems (not just throwing parts at it and guessing):
South Main Auto
Pine Hollow Auto Diagnostics
ScannerDanner
New Level Auto
FordTechMakuloco
For basic wrenching videos, I like EricTheCarGuy, Fuzzy Dice Projects, and Samcrac
For enteraining car-related stories, I like VinWiki, Rob Pitts, and Regular Car Reviews
I also like towing and recovery videos. RepoNut is a great channel. He did repossessions and explained a lot about the tips and tricks repo guys use, very informative.
Ron Pratt is a great channel for towing large trucks and heavy equipment, and recovering cars that have flipped over in a ditch or in the woods.
Other car-related entertainment I watch is Hoovie's Garage, Car Wizard, and Neutral Drop.