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On Wikipedia, most acronyms are written in all capital letters (such as NATO, BBC, and JPEG).Wikipedia does not follow the practice of distinguishing between acronyms and initialisms; unless that is their common name, do not write word acronyms, that are pronounced as if they were words, with an initial capital letter only, e.g., do not write UNESCO as Unesco, or NASA as Nasa.
Months, days of the week, and holidays start with a capital letter (June, Monday; the Fourth of July refers only to the US Independence Day – otherwise July 4 or 4 July). Seasons are in lower case ( her last summer ; the winter solstice ; spring fever ), except in personifications or in proper names for periods or events ( Old Man Winter ...
The section headings in the article start at the second level (==Heading 2==), with subsections at the third level (===Heading 3===), and so on. Sections should not skip levels from sections to sub-subsections (e.g., a fourth-level subsection heading immediately after a second-level heading). See also. Introduction to formatting (Wiki markup)
Captions normally start with a capital letter. The text of captions should not be specially formatted (with italics, for example), except in ways that would apply if it occurred in the main text. Several discussions (e.g. this one ) have failed to reach a consensus on whether "stage directions" such as (right) or (behind podium) should be in ...
Headings also help readers by breaking up the text and outlining the article. Start the first word and any proper nouns in headings with a capital letter, but leave the rest of the heading lower case. Avoid links within headings. Avoid overuse of sub-headings.
Therefore, if we keep in the article's source code all headings in sentence case, we still have the option one day to change the style sheet to title case and let the formatter do the conversation. If we actually wrote the articles using title-case headings, we would not have this choice. In that sense, using sentence case is more flexible.
The software treats all page 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), or category titles (as in Category:macOS) see WP:Naming conventions (technical restrictions) § Lowercase first letter.
Avoid using ALL CAPS and small caps for emphasis (for legitimate uses, see WP:Manual of Style/Capital letters § All caps). Italics are usually more appropriate. Double emphasis, such as italics and boldface, "italics in quotation marks", or italics and an exclamation point!, is unnecessary.