YouTube Secrets is a must-read if you want to start a YouTube channel to make money. Sean and Benji—the creators of multiple popular channels—help you unlock the YouTube algorithm, explain how to grow a channel from zero, and share many methods for making income. (Hint: Expect hard work!)
Contagious by Jonah Berger is a great read for anyone into marketing, influence, or the psychology of consumer behavior. It explores what makes people share. In other words: why do certain products, ideas, or content 'go viral'? A lot of research is simplified into 6 key principles: social currency, triggers, emotion, public, practical value, and stories.