Post Categories – core/post-terms
Display a post’s categories.
Use the Post Categories variant of Post Terms to display the Category terms associated with a post.
Screenshot

Example
This post does not have Categories but it does have other taxonomies. So here are this post’s values for Block classification.
HTML for the above block
<!-- wp:post-terms {"term":"block_classification"} /-->
Notes
- The Post Categories block is a variant of Post Terms – core/post-terms.
- The variant is determined by the
term
attribute. For the Post Categories block this iscategory
. - See also Post Tags – core/post-terms.