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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.
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) Table headers and captions (but not image captions) A link to the page on which that link appears, called a self link
As in the above example, citation markers are normally placed after adjacent punctuation such as periods (full stops) and commas. For exceptions, see the WP:Manual of Style § Punctuation and footnotes. Note also that no space is added before the citation marker. Citations should not be placed within, or on the same line as, section headings.
When it is useful to sub-divide these sections (for example, to separate a list of magazine articles from a list of books), this should be done using level 3 headings (===Books===) instead of definition list headings (;Books), as explained in the accessibility guidelines.
Instead, the first paragraph of the section should mention—and link to—that article. (Links in headings also cause accessibility problems for visually impaired readers using special software to read Wikipedia articles.) Don't put a footnote into a section heading. It looks ugly, and since a heading should be a noun clause, not a sentence ...
As with all images, but particularly the lead, the image used should be relevant and technically well-produced. It is also common for the lead image to be representative because it provides a visual association for the topic, and allow readers to quickly assess if they have arrived at the right page. Image captions are part of the article text.
An image sometimes includes a familiar object to communicate scale. Such fiducial markers should be as culturally universal and standardized as possible: rulers, matches, batteries, pens/pencils, footballs (soccer balls), people and their body parts, vehicles, and famous structures such as the Eiffel Tower are good choices, but many others are possible.
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.