Guilds and apprenticeships are the way forward for a lot of skilled trades. Learn the core fundamentals in online lectures and learn the specialized skills from an existing professional.
There's no reason even highly specialized fields like advanced science and engineering couldn't be structured this way except that companies don't want to pay to train someone for years before they even begin to become minimally useful (if they ever do).
Guilds and apprenticeships are the way forward for a lot of skilled trades. Learn the core fundamentals in online lectures and learn the specialized skills from an existing professional.
There's no reason even highly specialized fields like advanced science and engineering couldn't be structured this way except that companies don't want to pay to train someone for years before they even begin to become minimally useful (if they ever do).