You would use these functions for adding meta:
add_user_metaadds user metaadd_post_metaadds post meta
Notice that wp_insert_post will also return the post ID of the post created ( or a WP_Error object if it failed ). You can then use that in add_post_meta. See https://developer.wordpress.org/reference/functions/wp_insert_post/
Note though that tags/categories are not meta, they are taxonomies with terms, and use separate tables and functions for performance reasons.
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