Manuals and tutorials
Learning how to use the Adobe Apps is a cluster...
"Manuals" are obscure.
The various "How-To" videos and other tutorials are scattered all over the place and nothing seems connected or based the science of education. Instead it seems random, disjointed and haphazard.
Adobe, you have the resources to do a better job for the sake of current and new users. Don't abuse your near monopoly by neglecting the basics.