Convention: For page titles, always use lowercase after the first word, and do not capitalize second and subsequent words, unless the title is a proper noun. For multiword page titles, one should leave the second and subsequent words in lowercase unless the title phrase is a proper noun that would always occur capitalized, even in the middle of a sentence.
This convention often also applies within the article body, as there is usually no good reason to use capitals. Outside of Wikipedia, and within certain specific fields (such as medicine), the usage of all-capital terms may be a proper way to feature new or important items. However these cases are typically examples of buzzwords, which by capitalization are (improperly) given featured status.
In general, each word in English titles of books, films, and other works takes an initial capital, except for articles ("a", "an", "the"), the word "to" as part of an infinitive, prepositions and coordinating conjunctions shorter than five letters (e.g., "on", "from", "and", "with"), unless they begin or end a title or subtitle. Examples: A New Kind of Science, Ghost in the Shell, To Be or Not to Be.
Because credibility is a primary objective in the creation of any reference work, and because Wikipedia strives to become a leading (if not the leading) reference work in its genre, formality and an adherence to conventions widely used in the genre are critically important to credibility. See these recommended reference works for capitalization conventions:
The software treats all article titles as beginning with a capital letter (unless the first character is not a letter). For information on how to display article titles beginning with lower-case letters (as in eBay), see Wikipedia:Naming conventions (technical restrictions)#Lower case first letter.
However, when you create a link with the first letter of the link uncapitalized, like this, the first letter of the target page is automatically capitalized by the software. So like this points to the page titled "
Like this". However, the remainder of the link (after the initial character) is case-sensitive.
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