Know your story, so whenever you have to share it you can condense it, highlight situation-relevant details, but can get the essence of your story across.
This may useful for interviews, meeting new people, writing a Tinder bio
I can see why this would be useful selling a film, because you're doing the same with it's story
You're as good as you want to be, so make that part of your story. It will permeate through the rest of your life (what you wear, what you want, what people think of you)
This is an experiment I will be running in my life. If it resonates with you and more importantly works for you, please let me know here. If you have any relevant materials such as books or articles, I'd be happy to check them out too.