Editing tutorials

Basic training

 * Choosing a level editor
 * Basics of the Doom level format
 * Making a door
 * Making a lift
 * Making a switch
 * Making a teleporter
 * Aligning textures
 * How to make a great level
 * Using tags

Advanced tactics

 * Making a false wall
 * Making a fake 3D platform
 * Making a fake slope
 * Making deep water
 * Making superposed sectors
 * Making a self-referencing sector
 * Making an invisible floor
 * Making a multi-activation linedef
 * Advanced lift design techniques

Port-specific features

 * ZDaemon
 * Doomsday Engine
 * EDGE
 * Eternity
 * Doom Legacy
 * Risen-3D
 * Skulltag
 * Vavoom
 * WinMBF
 * ZDoom
 * Slopes

WAD editing

 * Choosing a WAD editor
 * Basics of the WAD format
 * Adding custom textures
 * Adding custom sprites
 * Adding custom music
 * Adding custom sounds