yelp (gnome-help) should be installed in PostmarketOS by default, if its' interface is Phosh (+ if you're apk adding the gnome apps)

This will help to avoid the not-obvious-to-fix problems like this:

https://gitlab.alpinelinux.org/alpine/aports/-/issues/13384

community/aisleriot: could not show help for any solitaire game