Here are links to the write-ups I reference most in my daily work -- which I tend to associate to "the things most people need to know."
Velocity: Kent Beck's Recommendation
14 Weird Observations About Velocity
How to Use Story Points
Stop Using Story Points
Esther Derby answers "Why Not Use Velocity as an Agile Metric?"
Ten part Q and A on Velocity blog series
What SHOULD we measure then?
I hope it's helpful.
A friend published a blog at Industrial Logic on Value-Based OKRs. I wonder if "objective-based" or "initiative-based" is a better term. I'm not sure what my opinion is here, and I lack experience with them, but I provide the link in case it is helpful to you.