Hmm I actually haven't read book that much but– my favorite lately is "The Power of Language" by Shin Dohyun and Yoon Naru. This book teach us how to speak properly without hurting someone's feeling or their pride, not to speak empty and unnecessary words, also teaches us how to use words so that we can convey our intentions and avoid dangers that may arise from our words. I recommend this to you if you need a self improvement book. 😊 Anyway, nice to meet you Saddam!