“Crucial Conversations”
Best book I’ve read during the pandemic and probably most useful in my current stint as an engineering manager. Also extremely applicable to personal relationships (marriage, kids, etc)
Nonviolent Communication is good for building up empathy, I recommend it as a complement. Crucial Conversations is a bit more practical and useful.
If you prefer more pop-culture taste, "Never Split the Difference" is kind of similar (even though philosophically different.) The story is all about FBI and kidnapping, so it's less boring while the points made are a bit shallower than "Crucial Conversations".
[1] https://www.amazon.com/Never-Split-Difference-Negotiating-De...