Capitalisation rules the checker applies
- The first word of every sentence.
- The pronoun “I”, always.
- Days of the week and months (but not seasons: “spring”, “winter”).
- Languages, nationalities and major holidays: English, French, Canadian, Christmas.
Title case vs sentence case
Title case (“The Quick Guide to Better Headlines”) is standard for book and article titles in US styles such as Chicago and APA. Sentence case (“The quick guide to better headlines”) capitalises only the first word and proper nouns. It is used by most UK publications and many websites, and it’s easier to read in long headings.