Title case depends on the style and the sentence
MLA leaves prepositions such as through lowercase inside a title. Chicago capitalizes longer prepositions. Both capitalize the first and last word of a title or subtitle and its principal words.
Review each word shows the suggestion and its reason. A word such as up can be a preposition or part of a verb; change its choice when the suggestion does not fit your sentence. Existing API and iPhone capitalization can stay as you typed it.
Worked example
MLA gives A Walk through the Garden; Chicago gives A Walk Through the Garden. The words and punctuation stay in the same order.
Before you rely on the result
MLA and Chicago suggestions apply to English. Capitalize each word uses the selected language for letters, including Turkish dotted I and Dutch IJ, but does not decide that language’s editorial title rules. Review names and compounds. AP and APA title styles are not offered.
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