Definition of playbooks:
(n) :
(US, American football) A book of strategies (plays) for use in American football (and by extension other sports or disciplines).
(n) :
(originally US, figurative) A book or (especially) any set of commonly employed tactics, strategies, and tips.
(n) :
A book containing the text of a play or plays.
(n) :
A book of games and amusements for children.