What files can go in a child theme?

Hi everyone

I’m preparing to update to 5.4 but before I do that I have a few questions. My site has quite a bit of customisation and I’d like to keep as much as possible of it, without having to make all the changes again.

So I’d like know what files can go in a child theme to preserve the changes? Currently I have the style.css, header, footer and functions there.

What else can go there? I was thinking about the language file and the class_white_label_themes and coupon_defaults.

Is that possible or will I have to recustomise?
Thanks in advance

Jasper