How to Organize your content? A self test:
Are you building a knowledge base with a more or less permanent table of contents? - use categories.
Are you collaboratively writing documents that need to be viewed in order, or published as a hard copy (PDF) - use structures.
Are you hosting discussions, blogs or forums where topics tend to come and go a lot? - use regular hypertext and wiki links, rather than getting bogged down in creating hierarchies that nobody will care about tomorrow.
Are you creating objects/pages that a time sensitive status - use trackers.
Are you using tikiwiki with multiple groups who need access to separate or private areas? - use
structures or
groups