#Topics help organize Posts so everyone stays notified and up to speed on the things they care about. If you Follow a Topic, you'll get notifications when someone creates a new Post with that Topic.
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Anyone can create a new Topic just by typing a '#' followed by the desired Topic name. 

Clicking on any clickable Topic embedded in a post will take you to the Topic landing page in it's host Community. Here, you can Follow or Unfollow the Topic by simply selecting the "Subscribe" or "Unsubscribe" button at the top right.
Additionally, you can also see who is following a Topic in your Community.

Also, from the left navigation, underneath your Subscribed topics, you can choose "See All"

This will bring up a window that will allow you to browse all of the Topics in a given community, and Subscribe or Unsubscribe to Topics. 
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