Do you want to receive email notifications if new topics are created in a specific category?
That is how you do it:
(1) Go to the category you like to watch
(2) On the top right side you find a button that probably shows a cirlce.
(3) Click on the button and this drop-down menue appears.
(4) click on „Watching“ on the top and you’ll receive email notifications for every new topic and post in this category
This should work when you have the right settings in your preferences.
To check click on your profile pic on the top right -> click preferences -> scroll down and look for this:
Enable the first to check boxes as shown in the image.