Good and bad sources of online/written coaching

[MarkP]

Thank you DeanH, vmax and Nitty50. There looks to be plenty to keep me busy, but at least I know I will be looking at decent coaching videos.

[Nifty50]

Barry Stark seems to have helped Kyren Wilson.

[vmax]

Snooker pro tips by Neilmaxman comes to mind, covers everything and explains sidespin better than anyone I've found online. Avoid any ex pros as they haven't a clue how they did it so can't explain the whys and wherefores.

[DeanH]

First place that comes to mind is Steve Barton (on here as well)
https://www.bartonsnooker.co.uk/

[MarkP]

Can anyone please tell me of any good YouTube sources for coaching videos (and any to avoid) please?

Also, although I know they are going out of favour, are there any good coaching books. I know they aren't the favoured medium now, but I learn better from a book. In particular, is "147 snooker drills and exercises" by Highfield and Horrix worth getting? Thank you.