<?php _e( $text, $domain ) ?> $domain
(string) (optional) Domain to retrieve the translated text Default: 'default
can't understand the second argument well. when i custom a theme, where the $domain's value shows on the theme, what value should i give it to.? could i write the $domain part optionally?i see some themes using its theme name as the $domain. but the document says Domain to retrieve the translated text.it's not a domain. why? some using other strings which doesn't have any relevance of the theme?