I did a bunch of courses through work on working with others (and leading through influence, etc), as well as having read books like Never Split the Difference, How to Make Friends and Influence People, 7 Habits of Highly Effective People, etc.

Then when I had kids I read a bunch of parenting books and the advice is pretty much the same! So much so that often they cross over, I think it was the 7 Habits book where they use examples of working with their kid to explain all the stuff about working with others.

Turns out kids are just little adults, and adults are just big kids.