Description: This is a professional work that systematically outlines the essence of digital marketing and its growth methodology, drawing upon Alex Schultz's over twenty years of practical experience in leading global markets. The book doesn't focus on simply acquiring more traffic, but rather on a more fundamental question: how to determine whether a marketing campaign truly generates effective and sustainable business results. Divided into three main parts--basic concepts, growth cornerstones, and channel analysis--this book helps readers build a solid foundation in digital marketing, master methods for scientifically evaluating marketing growth, and become proficient in using various digital tools.