We are negotiating all the time, whether we know it or not. Negotiation is just "a discussion aimed at an agreement."
Thinking about Negotiation
as a simple tool rather than a complex skill can help you get started
https://www.linkedin.com/pulse/innovation-negotiation-scare-many-really-simple-tools-angelidis/
Great Negotiation training
for those who will negotiate regularly
Getting to Yes
This is seminal book for anyone who negotiates for a living; I say it is a great book for anyone living because we all negotiate
Women have some unique challenges
related to negotiation and this book given women some great tips and advice
Thinking about Negotiation
as a simple tool rather than a complex skill can help you get started
https://www.linkedin.com/pulse/innovation-negotiation-scare-many-really-simple-tools-angelidis/
Improve negotiation skills
Fast Company highlighted five additional books to improve negotiation skills
https://www.fastcompany.com/3044777/six-books-to-help-you-improve-your-negotiation-skills
Harvard Law School
provides exercises and tips to practice what you learned