Avoid all caps
Long passages in all capitals are hard to read because there is not as much variation in letterforms for the eye to lock onto. Even in heads, using larger or bolder type, or changing fonts, are better ways to add emphasis.
Punctuation
Alignment
Paragraphs
Dashes
Quotes & Apostrophes
Caps
Underlined
Line Width
Justified vs. Ragged Right
Flush Left & Centered
