Don’t hyphenate the last word on a page.
Don’t hyphenate rag-right or rag-left copy.
Don’t hyphenate proper nouns.
Don’t let two lines in a row end in hyphens.
Don’t break a word at the end of the second-to-last line of a paragraph or at the end of a column.
When a word breaks, make sure at least three letters appear on the second line.
When possible, keep a prefix or suffix from breaking from the rest of the word.