Good video for sure.
I'm very thankful that many years ago in high school shop class 'Mr. Walden" made me dig deep and troubleshoot things until I understood what caused a problem and what to do to fix it. He would teach you how a system worked and then find ways to make you show you understood them.
For instance, one morning Joe Walden came over to my desk and gave me a brown paper bag with a distributor, cap, rotor, points, condenser, & wires all separated out of a GM 235 six cylinder that was on a shop stand. The engine was spun after the parts were removed. I was then instructed to install the parts, set the timing, and crank the engine. I did!
I also like the point made in the video about how having a proper knowledge of systems helps a pilot to understand when it's a minor concern or a major problem and how that helps the pucker factor in the moment. Situational awareness as to what you are seeing compared with knowledge of the systems can prevent a lot of stress!