Wikipedia:Helpbox
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A helpbox displays a concise overview of a topic in a small box on the screen. A helpbox acts as a condensed reference card (or "crib sheet") to quickly summarize a topic.
The use of helpboxes provides rapid, brief information to users, especially to long-term users who might have forgotten some of many options encapsulated into the condensed helpbox. Newer users might prefer to read the full help-pages, or tutorials, with numerous examples of each option.
A helpbox is limited, in size, to act as a concise reference card, rather than as a full tutorial with extensive explanations of each feature. When a topic is very large, then the helpbox could link to other sub-helpboxes, to keep each helpbox relatively short, but cover most aspects of a large topic.
Helpbox pages, such as {{wikitext}} are short reference cards to remind users about markup format or template parameters (see: {{convert/help}}).