Currently reading “How to win friends and influence people”, which is mostly common sense for friendly human interaction, but great for outlining the basics of avoiding an argument and steer an otherwise disagreeable person to your favour.
Also reading “The Fools Errand” from the Tawny Man Trilogy by Robin Hob, which is the follow on series from the Farseer Trilogy. I’d recommend giving these a shot if you enjoy fantasy reading, they become very addictive!