feature: @font-face status: use kind: css polyfillurls:
Use Google Fonts for hundreds of free, open-source fonts optimized for the web. Font Squirrel Generator for fonts you have license for using as web fonts. Always reference several font formats; WOFF2 is preferred, followed by WOFF, TTF/OTF. If you have to support outdated browsers (like old versions of IE and iOS Safari), also add EOT and SVG font formats. At CSS-Tricks you find a good article about a bullet-proof way of serving web fonts.
If you have to be aware of loading speed, take a look at A Comprehensive Guide to Font Loading Strategies.