how to add custom font files to template I like to add my custom font to my custom theming. All the font-files are in the file FONTS. And I also have a fonts.css file.
Where do I have to declare all this stuff?
You need to use libraries. Take a look here for a detailed explination: https://www.kinetasystems.com/blog/adding-google-fonts-to-a-drupal-8-theme