Wikipedia:RED

"Most new articles are created shortly after a corresponding reference to them is entered into the system"

Create red links everywhere they are relevant to the context for terms that should exist in the encyclopedia. An easy example is a technical term that merits a treatment beyond its dictionary definition, to help support its role for its existing context. A technical term probably qualifies because it is probably "notable" and probably should have that obvious title. But in many cases, a bit more care should be used in creating a red link, to ensure the red link is entirely proper.

Creating a red link also carries the responsibility to first ascertain that the red link is a valid title of a page, and that its foreseeable new subject matter will meet the notability guidelines for topics covering: people (WP:BIO), web content (WP:WEB), businesses (WP:CORP), and more.

Red links generally are not included in See also sections, nor are they linked to through templates such as {{}} or {{}}, since these navigation aids are intended to help readers find existing articles. Red links may be used on navigation templates with links to existing articles, but they cannot be excessive. Editors who add excessive red links to navboxes are expected to actively work on building those articles, or they may be removed from the template.

An article should never be left with a non-existent (red-linked) category in it. Either the category should be created, or else the nonexistent category link should be removed or changed to a category that does exist.

A red link to a person's name should be avoided, particularly when the name is used in a context which might cause readers to hold a low or critical opinion of the named individual. Frequently a red-linked name has been placed in an article, and subsequently a different editor has created an article about an entirely different person with the same or a similar name. All the rules that apply to our biographies on living people equally apply to red-linked names. When creating a biography from a red link be sure to use "what links here" to make sure all the incoming links are properly disambiguated. It's not rocket science: an article on the book Extra Virginity red-linked the author's name, journalist Tom Mueller, in 2012. Following that link reveals that Tom Mueller is in fact a rocket scientist with SpaceX, according to an article created in 2014.

...
Wikipedia