I would like to put all the categories at the bottom of the Main Page in a more compact way than what Special:Categories does.On this page are pages listed in a very nice way with bold letters.Can the same be done with categories instead of pages?
Possible to list categories on Main Page?
mediawiki
There are a bunch of MediaWiki extensions that provide such features.  A few you may want to take a look at include:CategoryTree: A simple extension that, like the name suggests, provides a way to include an expandable category tree on a wiki page.DynamicPageList: An extremely versatile extension that can be used to list pages according to various criteria, including membership in a category.