Great thread! thank you for asking this question, I too am more interested in Editorial as opposed to children's and I've gotten a lot out of these forums, but I have also been looking for more specific along the lines of what I'm interested in as well.

I can highly recommend Sterling Hundley's Ideation Lab 01 class if it's offered here again. It's a live class, so the real benefit is just getting the change to get his feedback and ask him your specific questions. He was a wealth of knowledge about the industry and even though the class is focused on how to generate ideas, he really takes his time in the live sessions and I found him to be very open and generous with his knowledge.

BTW @juliekitzes That https://dearartdirector.tumblr.com/ site is brilliant! Thanks for sharing that resource.