[Zikes]

Moving the goalposts to the furthest conceivable distance isn't going to prove anything to anybody. Nobody claimed you could completely master a trade skill just from watching YouTube videos.

[Retric]

The parent post (TeMPOraL) said:

have access to the best knowledge and experience entire humanity has produced

Sure, you can find plenty of videos on how make a hard boiled egg, apply tile, or do a card trick... But, that statement seems way over the top.

PS: Though, this is one case where I would haply be proved wrong.