User:The JoTS/Reference

Editing

 * Help:Magic words
 * All Magic words
 * Parser functions
 * w:MediaWiki:Interwiki map
 * mw:Manual:Collapsible elements
 * Interwiki images
 * Help:DynamicPageList

Templating

 * Help:Infoboxes/Tags
 * Help:Template parameters
 * Help:Lua
 * w:c:dev:Global Lua Modules
 * w:c:dev:Lua_reference_manual/Scribunto_libraries
 * tags, etc.
 * mw:Help:Extension:ParserFunctions
 * mw:Extension:Loops (some wikis)
 * mw:Extension:Variables (some wikis)
 * Interwiki Templating (you're a saint w:User:Rigel Kent!)

Administration

 * Help:System messages
 * w:User_blog:ChaoticShadow/Compilation_of_MediaWiki_Pages
 * Special:AllMessages
 * Help:Community_CSS_and_JS
 * Forum:Highlighting Usernames
 * Requesting MediaWiki Extensions
 * Help:Preloaded templates
 * Whatever's in here may be of use someday.

Policy
Not that all of Wikipedia's policies are applicable to every wiki, but some of them are a bit universal.
 * Via Wikipedia
 * wikipedia:WP:IAR
 * wikipedia:WP:CRYSTAL
 * wikipedia:MOS:N'T

Customization

 * Editing categories in wide-source mode
 * Help:Personal CSS and JS