The Guide to Markdown Mode for Emacs is a complete reference for the markdown-mode package for users of all levels. The book supplements the online documentation by providing more details about installation, configuration, and movement and editing commands. There are examples throughout that show the Emacs way of editing as it relates to Markdown. Additionally, the book covers more advanced usage such as subtree and structure editing, defun and page movement, marking, narrowing, region management, imenu, etc. It goes beyond the basic documentation by also discussing interaction with other packages such as Flyspell mode, CriticMarkup mode, Pandoc mode, Deft, HTML as Markdown mode, MathJax, and more. Finally, it also contains tips and tricks for custom configuration options such as custom CSS stylesheets, using pre- and post-processors, customizing faces, keeping notes in a local wiki, etc.