You can give them this url http://www.example.com/?cat=42&feed=rss2
This one if permalinks are enabled http://example.com/category/categoryname/feed
Replace the site url & also the cateogries id or slug with the correct one
UPDATE IN RESPONSE TO COMMENT
Display a list of categories to the user maybe with wp_dropdown_categories
. Save the id of the category the user subscribed to in the database by using the function add_user_meta()
or update_user_meta
, then on the template on which you want to show the posts use WP_Query
to retrieve all the posts.
If you don’t know the functions, check out their reference on codex, it’s easy to find on google
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