The only font that installs with Unity is Liberation Sans, but fonts default to Arial if you have Arial installed on your computer. If you have Arial installed on your computer, it will be the only font available in the initial list of fonts to choose from. If you want your text to render with a different font, you must import it into your project's Assets folder. The process is pretty simple and no more difficult than importing a sprite into your project.
The font file formats accepted by Unity are .tff (TrueType) and .otf (OpenType). You can get these files in multiple places. My favorite places to find fonts are as listed:
- Google Fonts: https://fonts.google.com/
- Font Squirrel: https://www.fontsquirrel.com/
- DaFont: ...
