In an earlier post I said:
Listen to good playing (which means leave yertube alone, go for proper stuff)
For youtube the same caveats apply that were expressed here earlier: there is an awful lot of stuff around put up by people who don’t know their arse from their elbow. The advice to learn from a player well grounded in traditional music (which I assume is the goal) is given for a reason. These are generally simple tunes with a bit of effort anyone can learn to play the notes. To carry them off though, do them justice send make them shine, that isn’t enough.
I remember being in a piping class after three years on the pipes where the teacher told me ‘you have all the notes, now you’ll have to start play the music’. Now there was a novel insight. I have been trying ever since (FWIW this occurred forty years ago). Playing traditional music, any traditional music, the fine detail is of extreme importance. Fine detail a beginner or anyone not well versed in that particular music may not even perceive. Detail in rhythms, ornamentation, phrasing. Learning from good players in a particular tradition embeds these details, often without the learner being aware of it and yet, after a few years it will sink in and the exposure will shine through. Learning the ‘wrong’ way makes it very hard to go back and rectify. These things need to be assimilated, by immersion in a particular music, played by players who ‘have it’. Because that’s the thing: you’re not just learning tunes, you’re learning a specific type of music, with all its intricacies and oddities. And doing so you will want to get an understanding of it that goes beyond ‘learning a tune’, an understanding that sees you develop a consistent, personal style of playing.
The internet is a bit of a curse for that sort of thing. Every man and his dog seems to want to ‘share’ their experience, even if they don’t have any too speak of. A beginner will not be able to discern what is right and what is leading them up the garden path.
Youtube can be a helpful resource, but only if you know what to look for. I think a blanket recommendation to learn from youtube is not a good one for anyone trying to have a serious stab at this sort of stuff.