I didn't. People who think they're learning from YouTube are mostly not learning, just thinking they did. I watched someone design a common-base amplifier. Can I design a common-base amplifier now? No, I can't. I now have a slight awareness of what one does, but I couldn't design it.
And at your standard of "learning", 95% of students don't learn anything anywhere. I also align with what you must think of as "true learning", but at that standard, most people are "mostly not learning" at regular schools and unis.
