sans serif
font-family: Arial, Helvetica, sans-serif;
font-family: Arial, Helvetica, Geneva, Tahoma, Verdana, sans-serif;
DONT ADD ANYTHING HERE!
serif
font-family: 'Times New Roman', Times, serif;font-family: Georgia, 'Times New Roman', Times, serif;
monospace
font-family: 'Courier New', Courier, monospace;
font-family: 'Courier New', Courier, Monaco, Menlo, monospace;
Example (serif)
Times New Roman
Times
Georgia
Example (sans-serif)
Arial
Helvetica
Verdana
Geneva
Tahoma
Trebucket MS
Lucida Sans
Example (monospaced)
Courier
Monaco
( Monaco )
Monospace (code default on MacOS)
Menlo (code default on Firefox)
Lucida Console
Notes
Arial and Helvetica are almost
identical
Courier was initially created for IBM's typewriters
Menlo is a
monospaced sans-serif typeface first
shipped with Mac OS X,
superseding the Monaco typeface,
which had long been the default monospaced typeface on macOS.
Trebuchet MS
is a sans-serif typeface designed for Microsoft,
named after the trebuchet, a medieval siege engine.
Lucida is an extended family of related typefaces to be
extremely legible when printed at small size or displayed
on a low-resolution display,hence the name, from 'lucid' (clear or easy to understand)
Mnemonic
Monaco is
monospaced