Wikipedia:HOWTOPAGES

The project namespace or is a namespace consisting of administration pages with information or discussion about . Pages in this namespace will always have the prefix . They can also be reached by alias WP: or the standard (for any site) prefix Project:. Its namespace number is four (4).

For lists of pages in the project namespace, see:

A main gateway for the project namespace is Community portal. The Community Portal includes categorized links to the more commonly used pages related to the project. A link to the Community Portal page is available in the sidebar.

Some pages are designed for discussions, such as the Village pumps. Others serve as noticeboards to draw attention to discussions taking place elsewhere, such as the centralized discussions page and various requests for comments pages. For a listing of ongoing discussions and current requests, see the dashboard. To ask a question or make a request, see the request directory.

Maintenance pages are used to help facilitate the organization and clean-up of articles to bring them up to encyclopedic standards. These editor and bot generated pages typically contain articles and others pages requiring maintenance or attention. (e.g., ). The Special namespace also contains bot generated maintenance reports. (e.g., ). See for details.

Essays and information pages may be established by writing them and adding {{}}, {{}}, {{}}, or similar template to the page. However, the project namespace contains many pages and a lot of information, try to avoid creating new pages unnecessarily. Before creating a new page, you should consider looking through the topical index, essay directory and help directory to see if the material belongs at a page that already exists.

...
Wikipedia