See also the Emacs Lisp section.

• GNU Emacs Manuals Online
• GNU Emacs Reference Cards
• EmacsWiki
• Mastering Emacs

• Stack Overflow: How to generate autoloads for elpa packages?
• Mickey Petersen: Keeping Secrets in Emacs with GnuPG and Auth Sources

• Ediff
• CC Mode
• PlantUML
• Gnus
• Tramp
• (Inferior) Shell
• Irony

• Environmental Settings
• (Multiple) Compile Commands
• Compile History
• Startup Performance

Last my Linux key bindings PDF and a screenshot of my (default) theme.