We all (well, apart from Joe Pie it seems!
) love BlondiHacks, and her Lathe Skills and Mill Skills playlists are often deservedly well-regarded. MrPete is also often talked about (I love the man*), and to be fair, Joe Pie is also very good (albeit a little click-baity with his video titles), but there's another YouTube machinist teacher who is less well known, but just as good as the others and arguably in some ways better.
Take a look at ThatLazyMachinist on YouTube. I've been watching a lot of his videos and have learned a lot from them.
If you're after something that goes a little deeper into the subjects us beginners often need help with, Marc's videos are very good.
They tend to be set out in a more 'course'-like way (he used to be a shop teacher) and do delve deeper into what's going on behind the scenes (his videos on chips, feeds, and speeds, for example talk about phases of chip formation: penetration, accumulation and separation).
He has a sense of humour that's very dry, but also a bit absurdist (think it's the French Canadian coming out in him!) that lightens up his videos nicely too.
The sound on the videos (as he himself has acknowledged) isn't Dolby beautiful but you can always hear what he's saying (although he does pronounce 'x' as '
icks'; that French thing coming out again, I guess).
Warning though, if you're averse to safety being talked about and get irritated by anybody who isn't afraid to bring the subject up regularly (he doesn't bang on about it for long periods, apart from in his four part 'Safety' series obviously, but he will briefly mention safety at the appropriate point in many of his videos), then Marc's videos may not be for you.
He has a complete beginners machinist course (
https://youtube.com/playlist?list=PLudDtFHckFPiWdQbI-BmDcpIQtR_x0xxZ&si=hU0_YYkP-xr4SuFX ), that is definitely worth checking out.
*
I reckon if my ADHD had been diagnosed and treated and MrPete had been my DT teacher (Design and Technology; that was what 'shop class' was called in my school in the 1980's), I may well have ended up doing something very different as a career than the software engineering career I burdened myself with!