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Very short sections and subsections clutter an article with headings and inhibit the flow of the prose. Short paragraphs and single sentences generally do not warrant their own subheadings. Headings follow a six-level hierarchy, starting at 1 and ending at 6. The level of the heading is defined by the number of equals signs on each side of the ...
Headings and subheadings can be added by clicking Advanced then Heading in the extra toolbar line which now appears. Selecting "Level 2" will format text as a main heading, the most frequently used subdivision of any page. "Level 3" gives you a subheading for a Level 2 heading, and so on.
Some of these matter; others have no effect on the way that the reader sees headings. Putting a blank line below a heading is completely optional. It makes the wikitext more readable but doesn't affect what the reader sees. Also optional (and the norm) is a single blank line above a heading—it makes no difference to the reader.
Headings and subheadings are a way to organise an article. If an article discusses several topics and dedicates more than a couple of paragraphs to each, you can make the article more readable by inserting a heading for each topic — that is, creating a section for each topic.
Headings are styled through CSS and add an [edit] link. See this section for the relevant CSS. Four or more headings cause a table of contents to be generated automatically. Do not use any markup after the final heading markup – this will either break the heading, or will cause the heading to not be included in an edit summary.
The heading must be on its own line, with one blank line just before it; a blank line just after is optional and ignored (but do not use two blank lines, before or after, because that will add unwanted visible space). For technical reasons, section headings should: Be unique within a page, so that section links lead to the correct place.
Headings and subheadings can be added by clicking Advanced then Heading in the extra toolbar line which now appears. Selecting "Level 2" will format text as a main heading, the most frequently used subdivision of any page. "Level 3" gives you a subheading for a Level 2 heading, and so on.
Section headings. Type two equal signs at the beginning and two more at the end of a line of text. (If you create at least four headings, Wikipedia automatically creates a table of contents, as you'll see in a moment.) Boldface. Type three apostrophes (') before and after the text you want to bold. Italic. Type two apostrophes (') before and ...