This is “Additional Font Categories”, section 1.1 (from appendix 1) from the book Designing Business Information Systems: Apps, Websites, and More (v. 1.0).
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In earlier chapters, we discussed the difference between serif and sans serif fonts. However, as you might imagine, the story is far more complex than that. There are many more specific font categories. These categories are based on fonts that share certain characteristics. We consider five basic font classifications though there are more. To create contrast, mix fonts from different classifications. Never mix two fonts from the same category—it will look like a mistake. The classifications are adapted from Robin Williams and are shown here enlarged to highlight the differences.