Widows and orphans occur when the first line of a paragraph is the last line in a column or page, or when the last line of a paragraph is the first line of a new column or page.
Professionally printed material in English typically does not indent the first paragraph, but indents those that follow. For example, Robert Bringhurst states that we should "Set opening paragraphs flush left."[4] Bringhurst explains as follows.