Decision doc - for getting group alignment on a type 2 decision. 

Retro doc - for periodically improving team cohesion and processes (or after an incident).

Strategy doc - for setting, communicating, and reaching alignment on strategy.

Project tracker - for keeping track of basic tasks and communicating project status.

Investigation doc - for digging into problems that don't have clear explanations.

Direct report 1:1 - basic template for effective manager 1:1s.

All-hands slides - basic set of slides of meeting with a big group on a regular basis.

Roles & Responsibilities clarifier - for resolving ambiguity over responsibilities.

Product Management