You can set 5 font families and variants for:

• Baisc font [Family, Variant, Subset, Font size]
• Bold font [used for the STRONG tag]
• Headings  [Family, Variant, Letter Spacing, Text Transform]
• Menu, buttons and metas (sets also buttons, metas and widget headers) [Family, Variant, Letter Spacing, Font Size, Text Transform]
• Logo (if you use a picture logo, is suggested to set the same font as your normal text, to avoid useless font downloads)