when do you use a colon for lists
The colon (:) is a punctuation mark consisting of two equally sized dots centered on the same vertical line. A colon precedes an explanation or an enumeration, or list. A colon is also used with ratios, titles and subtitles of books, city and publisher in bibliographies, Biblical citations between chapter and verse, and -- in American English -- to separate hours and minutes, for business letter salutations and in formal letter writing.