Get Post Taxonomy Slug

Hi,

You can use the option Post term list to show the listing term of the post in the tab Post, see my screenshot https://share.getcloudapp.com/z8ux9Oyg

Or use the function get_the_terms() via mb proxy to show the slug of the first term, here is the sample code

{% set termList = mb.get_the_terms( post.ID, 'category' ) %}
{{ termList[0].slug }}

For more information, please follow the documentation.
https://developer.wordpress.org/reference/functions/get_the_terms/