I'd like to send email notifications when new posts are saved. But users can select post categories they want to subscribe to. Available plugins are no solution to me – I really need my own code base. Even though I am fairly new to WP there is no problem with all that … but I don't know how to connect custom taxonomies to users.
Is it possible to list all categories on the user profile page (checkboxes) and save theme in the usermeta table? Or do you mean it is better to put all the subscriptions into a new table and use a third pivot table to connect taxonomies and users?
Or another solution? Any ideas are appreciated :-) Many thanks!