The document provides guidance for marketers on creating visual content. It discusses why visual content is important given increasing information overload. It then outlines 5 types of visual content that marketers can create, including photos, videos, images, infographics, and presentations. The document also presents 10 design principles called "Commandments of Do-It-Yourself Design" to help marketers who are not designers create effective visual content. The principles emphasize understanding the purpose of the content, establishing a content hierarchy, and respecting simplicity and legibility in design.