One of the sentences at the very start caught my eye:
> I thought to myself: why is there so little actionable advice out there about negotiation?
There's a wealth of actionable negotiation advice if you know where to look, like Harvard Business Review and Harvard Law, First Round Review, among others.
One of the big pieces on negotiation I got from Harvard[0], from their Program on Negotiation. I did not attend Harvard, but reading two or three of their articles a week goes a long way.
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[0]: https://www.pon.harvard.edu/uncategorized/what-is-anchoring-...
Getting to Yes and Bargaining for Advantage are also good reads related to this topic
Getting to Yes is a good very short book that has some gems in it. We used it in some business school class or other I took.