Line width should be 40-65 characters wide
When your line length is too short, you end up with too much hyphenation and, in justified text, very irregular wordspacing. When your line length is too long, your reader’s eye gets lost from one line to the next.
Punctuation
Alignment
Paragraphs
Dashes
Quotes & Apostrophes
Caps
Underlined
Line Width
Justified vs. Ragged Right
Flush Left & Centered
