Playbook means a stock of usual tactics or methods.
They are tested, and it worked or not.
What’s your playbook of marriage, losing weight, or sleep?
What has worked for you so far and not?
Share with people around you. Let them learn from your experience, and they modify it with their own twists.
For Business Side, I like Reid Hoffman’s way. Constantly iterate and iterate your tactics and try new experiments.
“If your playbook is the same as your competitor’s, you are in trouble, because chances are they are just going to run your playbook with a lot more resources!”