De doc is about templates. The function files contain pieces of code (for example the review buttons, favorite buttons etc . .). I want to change those pieces of code without editing the core files. Can the function files be added to the child theme the same way you can add the template files? Or be overridden some other way?
Along with that I saw that you can also add a imge to a categorie. Where does this image appear? I see that you can show the icon in the shortcode but is it also possible to show the image instead?