Google, Editorial Team, Google
In Google's internal documentation for code reviews, they cover these categories of what to look for:
Design, Functionality, Complexity, Tests, Naming, Comments, Style, Consistency, Documentation, Every Line, Context, & Good Things
This guide explains what OKRs are and details how Google sets their OKRs.
This guide from Google contains their guide, slides, and workbook for how they train new managers.