A playbook has three attributes: (1) it gives you plays that can be reliably repeated, (2) these plays can be taught to others, and (3) one can look back and check whether the plays were used properly.
In the context of product building, there are multiple playbooks: how to hire, how to build an organization, how to grow people, how to grow as a leader, how to build products that people want, how to grow these products …
All these playbooks needed a home. So playbooks.io was born along with a dedicated YouTube channel where I will post video playbooks regularly (the first 6 are already live).