BASIC PRINCIPLES FOR USING TYPOGRAPHY
1. Two Fonts
Most documents should use two different fonts (rarely one or three or more), typically from two different font families. Use one font for headings and titles and the other for body text.
2. Font Families
Know your font families and use them appropriately. Most fonts can be labeled as one of the following: serif, sans-serif, script, decorative, or grunge.
Apply the appropriate font to the personality of your document. Recognize that subtle nuances in typefaces make big differences in the personality of your document. Avoid default and overused fonts.
Be sure your font is legible for the specific word(s) you are displaying. Some typefaces work well for particular words but not for others. If a word is real common, you can use less legible fonts. For names, use only very legible fonts.
Increase readability by increasing line spacing, using legible fonts, shortening line length, and using heavy enough weight to contrast background.