All The Tropes:What Page Types Mean

Trope: The backbone of this site. A description of a recurring pattern in fiction which should come with a list of examples. Example: Sealed Evil in a Can.
Work: A description of a piece of fiction in which tropes may occur, containing a list of the tropes that exist in that piece of fiction. This page type enables reviews, the YMMV tab, and several other features. Additionally, if the page for an individual episode of a series has its own reviews^[1], it will need this page type for tech reasons. Example: Tomorrow Never Dies.
A creator or person: A page about some real-life entity associated with the creation of works (like an author, an actor or a production studio). Example: David Tennant.
A work's examples page: A page which is not the main page of some work, but lists some of the tropes that occur in that work anyway. These take three main forms: splits of tropes that occur when the main work page gets too big, Character Sheets, and pages that include a list of tropes.^[2] Examples: Avatar: The Last Airbender/Tropes A-H, Star Trek: Deep Space Nine/Characters, Community S1 E23: Modern Warfare.
Index: Also called Category. A page whose main function is to list other pages. A page is included in an index by adding a Category tag (either via the HotCat tool at the bottom of the page, or typed directly into the page text in the form [[Category:Category Name Here]] -- usually at the bottom of the page). Example: Espionage Tropes.
Sub-page: A page which is about a trope or work, but is not the main page about that trope or work. Most of these are pages in companion Namespaces like Headscratchers, YMMV, or Wild Mass Guessing. Example: Properly Paranoid/Quotes.
A Useful Note: A page about real-life facts, with an eye toward explaining why and how they're used in fiction. Example: Japanese Honorifics.
A Just For Fun bit: A page which was created to be entertaining or funny and doesn't fit into any other category. Example: Quantum Mariah Carey Problem.
A contributor: A page about someone who edits the wiki. Example: Looney Toons.
A disambiguation: A page used to point readers in the right direction when multiple other pages share a name. Example: Leviathan
Administrivia: A page that exists in order to explain stuff about how the wiki works. Example: What Page Types Mean.

↑ For example, My Little Pony: Friendship Is Magic S2 E22: "Hurricane Fluttershy"
↑ Note that the YMMV page for a work, despite consisting of a list of examples, should not have this type but should instead be set as a sub-page; otherwise, you'll get a note saying the examples it lists don't belong and should be moved to the trope's YMMV page.

[1] For example, My Little Pony: Friendship Is Magic S2 E22: "Hurricane Fluttershy"

[2] Note that the YMMV page for a work, despite consisting of a list of examples, should not have this type but should instead be set as a sub-page; otherwise, you'll get a note saying the examples it lists don't belong and should be moved to the trope's YMMV page.

[1]

[2]