Which is the best book to learn communication skills?

Apart from books, there are plenty of online resources available on YouTube and online learning platforms such as Udemy.

Personally, I will recommend watching videos on topics such as: Communication Skills, Business Communications, and Body Language helpful. The added advantages of consuming video content, over books, is that you can also observe how the presenter is speaking and presenting. These non-verbal cues are part of anyone’s communications skillsets, and should not be ignored.