If you use caps and lowercase style:
▪Capitalize the first word and the last word, no matter what these words are. ▪Capitalize the first word after a colon, no matter what this word is. ▪In general, capitalize all other words as well unless they’re mentioned in the following rules. ▪Don’t alter the capitalization of abbreviations, feature names, product names, company names, and case-sensitive words. If one of these words is the first word, try to rewrite the heading. ▪Don’t capitalize articles (a, an, the). ▪Don’t capitalize coordinate conjunctions (and, as, but, or, nor, so, for, yet). ▪Capitalize Is, Are, Be, If, It, Its, That, This, Than. ▪Don’t capitalize the following prepositions and adverbs: at, by, for, of, in, up, on, to. Many style guides also suggest not capitalizing from, into, off, onto, out, over, and with, without, within.
However, always capitalize the mentioned prepositions if they’re part of a verb phrase, such as Set … Up, Plug … In, and so on. ▪Capitalize each word of a hyphenated compound if the word after the hyphen is a noun or proper adjective, or if the words have equal weight.
Don’t capitalize a second word that modifies the first word, such as Follow-up, Add-in. ▪If a short word that would usually be lowercased according to listed rules is used in parallel with a capitalized word of equal significance, capitalize the short word as well. ▪In words that use the letter “e” as a short form for “electronic,” capitalize both the “E” and the first letter.
Yes:
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How to Install the Software
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Yes:
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Setting Up the Computer
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Yes:
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What Is a Device Driver?
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Yes:
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To Use This Manual
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Yes:
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How to Use the Manual
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Yes:
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How You Can Use the Product
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Yes:
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A How-To Approach
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Yes:
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Using the 64-bit Version
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Yes:
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Risk of Accidents In and Around Airports
(Note: In and Around are used in parallel, so In is written with a capital letter as well.)
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Yes:
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E-Learning and Multimedia
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