when do you use a colon for lists
Colon (punctuation) 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.[1]
Sentence spacing The desired or correct sentence spacing is often debated but many sources now say additional space is not necessary or desirable.[9] From around 1950, single sentence spacing became standard in books, magazines and newspapers,[10] and the majority of style guides that use a Latin-derived alphabet as a language base now prescribe or recommend the use of a single space after the concluding punctuation of a sentence.[11] However, some sources still state that additional spacing is correct or acceptable. The debate continues.[3] Many people prefer double sentence spacing for informal use because that was how they were taught to type.[12] There is a debate on which convention is more readable; the few recent direct studies conducted since 2002 have produced inconclusive results.[13]