Or to put it a different way: open source maintainers are one of the most verifiably self-taught people in the history of the world, *when they want to be*. Happy to dig into tools, Google, books, mailing list archives, source code, stack traces, whatever. *If they’re motivated and have time for it.*
Saying “what they really need is… an online course” is… actually a tacit admission that what’s actually missing is time and motivation.