Looking for the ability to get email notifications or subscribe to threads, dont see where it exists at the moment.
We should also put it out there that there is an app for IOS and Android that allows you to use a Discourse Board.
At the bottom of a thread you’ll see the word “Normal” with an empty circle. That changes the notification setting for threads.
Also, at the top right of the page, when viewing a category, you can adjust notifications for an entire category.