One key part of being a great marketer is understanding how (and why) people think and act the way they do. It’s much harder to create compelling marketing, for example, if you don’t know why it would be compelling to your audience in the first place. Before you jump into the tactical nitty-gritty of marketing, it’s really helpful to understand how people operate … which is essentially what the entire field of psychology attempts to explain. Understanding some key principles of psychology can take your marketing from good to amazing.