The simplest way to add a heading in your document is to apply a heading style.
If your document is open for editing
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Highlight the text you want to use as a heading.
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On the Home tab, in the Styles section, choose your heading style.
If you haven't already opened your document for editing
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Select Edit Document > Edit in Word for the web.
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Type your heading and keep your cursor on that line.
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Select Home, and then choose the heading style you want in the Styles gallery.
Tip: If you don't see the style you want, click the down arrow next to the Styles gallery to expand the gallery.
