How to customize global typography settings?

Go to Dashboard > Appearance > Customize > Typography then you will see following options:

Basic font

• Default (PT Sans)
• Google Font
• Arial
• Arial Black
• Comic Sans MS
• Courier New
• Georgia
• Impact
• Lucida Console
• Lucida Sans Unicode
• Open Sans
• Palatino Linotype
• Tahoma
• Times New Roman
• Trebuchet MS
• Verdana
• MS Sans Serif
• MS Serif

Basic font (from Google Fonts) (text field to put font name, for example: Roboto)

latin (latin, latin-ext) (checkbox)
greek (greek, greek-ext) (checkbox)
vietnamese (vietnamese) (checkbox)
cyrillic (cyrillic, cyrillic-ext) (checkbox)

Font for headings, navigation etc

• Default (Arvo)
• Google Font
• Arial
• Arial Black
• Comic Sans MS
• Courier New
• Georgia
• Impact
• Lucida Console
• Lucida Sans Unicode
• Open Sans
• Palatino Linotype
• Tahoma
• Times New Roman
• Trebuchet MS
• Verdana
• MS Sans Serif
• MS Serif

Font for headings, navigation etc (from Google) (text field to put font name, for example: Roboto Slab

latin (latin, latin-ext) (checkbox)
greek (greek, greek-ext) (checkbox)
vietnamese (vietnamese) (checkbox)
cyrillic (cyrillic, cyrillic-ext) (checkbox)