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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.
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.
Subsection headings of level 3 and below (===Subheading===, ====Sub-subheading====, etc., markup). There are five heading levels used in writing articles (the top-level one being reserved for the auto-displayed page name). [b] Terms in description lists (example: Glossary of the American trucking industry)
Please do not use a "level one" heading (only one equals sign on each side, i.e.: =Heading=). This would cause a section heading as large as the page title at the top of the page. Heading names of sections (including subsections) should be unique on a page. Using the same heading more than once on a page causes problems:
Headings and subheadings are a way to organize 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.
The main headings in the article are second level headings, defined with two equals signs in the wikitext. You never need to use the top-level heading style, defined with one equals sign, as it is reserved for article titles.
A subhead (also subhed, sub-headline, subheading, subtitle, deck or dek) can be either a subordinate title under the main headline, or the heading of a subsection of the article. [5] It is a heading that precedes the main text, or a group of paragraphs of the main text.