Each family subdirectory contains the `.ttf` font files served by Google Fonts, plus a `METADATA.pb` file with metadata for the family (such as information on the project designer(s), genre category, and license - [learn more](https://github.com/googlefonts/gf-docs/tree/master/METADATA)) and a `DESCRIPTION.en_us.html` with a description of the family in US English.
If you find a problem with a font file or have a request for future development of a font project, please [create a new issue in this project's issue tracker](https://github.com/google/fonts/issues).
To learn how to use git, Github provides [illustrated guides](https://guides.github.com) and a [youtube channel](https://www.youtube.com/user/GitHubGuides), and a [learning game that takes just 15 minutes](https://try.github.io).
The SIL Open Font License has an option for copyright holders to include a Reserved Font Name requirement, and this option is used with some of the fonts.
These fonts are usually the result of collaborative projects, where you are invited to discuss issues with the designers and even contribute to their ongoing development.