Understanding which editorial standard to use is essential across academia, journalism, medicine, and web development:

• APA 7th Edition (American Psychological Association): Capitalizes major words and any word that is 4 letters or longer. Prepositions with 3 or fewer letters are lowercased. Subtitles following a colon are capitalized.
• Chicago Manual of Style (CMOS 17th): Lowercases all prepositions regardless of length (e.g., between, through, without, against) unless first/last word or after colons.
• MLA 9th Edition (Modern Language Association): Strictly lowercases articles, coordinating conjunctions, and prepositions regardless of character count, prioritizing literary aesthetics.
• AP Stylebook (Associated Press): Standard for news journalism. Capitalizes prepositions that are 4 letters or longer (e.g., With, From, Over, Into). Prepositions of 3 or fewer letters remain lowercased.
• AMA Manual of Style (11th Ed - Medical): Standard in biomedical journals and healthcare research. Capitalizes words of 4+ letters, first and last words, and both elements of hyphenated compounds.
• Bluebook Legal Citation: Standard in legal publishing. Capitalizes words of 5+ letters (prepositions like Between, Through, Against). Lowercases prepositions of 4 or fewer letters (*with, from, into*).
• Wikipedia Manual of Style: Uses sentence casing for Wikipedia article headings and title case for creative work citations.
• Developer & URL Cases: Instant transformation into kebab-case (SEO slugs), camelCase (JavaScript), PascalCase (React components), snake_case (Python/SQL), and CONSTANT_CASE.

Three of the most common title capitalization stumbling blocks:

• Hyphenated Compounds: Under APA 7th, AMA, and CMOS guidelines, both elements of a hyphenated compound are capitalized (e.g., Self-Driving, High-Tech, State-of-the-Art).
• Subtitles Following Colons: In recognized style manuals (APA, Chicago, MLA, AP), the first word after a colon (: ) or an em-dash (—) represents the start of an independent clause or subtitle and must always be capitalized.
• First and Last Word Rule: Without exception, the first word and the last word of a headline are always capitalized in every style guide, even if they are short prepositions.

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