Typefaces on your system.
WHAT FONTS ARE
Files describing how characters are drawn.
WHY THEY MATTER
A document using a font the recipient lacks is displayed differently, and the layout may break.
WHAT TO DO ABOUT THAT
Use widely available fonts for anything shared as a document Send a portable document, which embeds them
WHAT TO BE CAREFUL WITH
Installing many fonts, which slows programs that list them Fonts from unknown sources Licensing, for commercial use
THAT LAST POINT
Fonts are licensed. Using one commercially without the right licence is an infringement.
WHAT TO CHECK BEFORE USING A FONT IN BRANDING
Its licence, and whether it covers your use.
WHAT TO KEEP
A record of which fonts your materials use, and their licences.
WHAT TO INSTALL
Only fonts you actually use.
WHAT TO DO ABOUT A DOCUMENT DISPLAYING WRONGLY
Check whether the font is present.
WHAT TO PREFER FOR ANYTHING ON THE WEB
Fonts served with the site, or widely available ones, with a fallback specified.