“**Understanding Categories and Category Pages:**
– Categories help readers navigate subject areas and find related articles.
– Categories are typically located at the bottom of article pages.
– Category pages are in the Category namespace and act as categories.
– Category pages contain sections for subcategories and pages in the category.
– Pages are added to categories by including a category declaration in wiki markup.
– Sorting category pages is based on default rules and sort keys specified in the category tag.
**Working with Category Pages:**
– Actions with category pages range from simple to elaborate.
– Linking to a category page without adding the current page to the category.
– Retrieving raw category information using the API with a specific query format.
– Hidden categories are not displayed to users.
– Moving and redirecting category pages.
– Hiding categories using the __HIDDENCAT__ tag on a category page.
**Searching and Listing Categories:**
– Searching for pages in categories using the search tool.
– Listing all categories using Special:Categories and Special:AllPages/Category:.
– Displaying category trees and page counts using {{PAGESINCATEGORY:Example}} and Special:CategoryTree.
– Finding articles for a category using various tools like What links here, PetScan, and featured articles.
**Categorizing and Templates:**
– Templates should be categorized similarly to articles.
– Utilizing templates to efficiently add pages to categories.
– Categorizing redirect pages following specific conventions.
– Using parser functions to make transcluded categories dependent on variables.
**Monitoring and Related Changes:**
– Watching category additions and removals via the Category changes filter.
– Utilizing scripts like User:CategoryWatchlistBot for monitoring changes.
– Understanding related changes with categories using the Related Changes feature and DynamicPageList extension.”