IMO the most interesting (and impactful, powerful) stuff is just plain-old psychology, like what is read in therapy books. You can apply it in nearly any situation in so many ways.
It adds on to intuition you'd feel normally, the really complicated social behaviors we act out on into concepts and frameworks. You can choose how you interpret and use it.
If you don't believe me, google: Dialectical behavior therapy, attachment theory, schema therapy with "filetype: pdf" in the query and load em into PDF reader. Kindle has good books.
Schema Therapy: https://www.guilford.com/excerpts/young.pdf
Attachment theory: https://www.behaviorology.org/oldsite/pdf/AttachmentTheoryBe...
I'm trying to spread the message far and wide so people can know and get woke. This is stuff I wish I knew 15 years ago.