Subscribing to categories and topics
Some key definitions to understand are:
Watching - You will be notified of every new post in the topic. The count of unread and new posts will also appear next to the topic's listing.
Tracking - You will be notified only if someone mentions your @name or replies to your post. The count of unread and new posts will also appear next to the topic's listing.
Regular - You will be notified only if someone mentions your @name or replies to your post.
Muted - You will never be notified of anything about this topic, and it will not appear on your unread tab.
To subscribe to a Category (or forum) go to your preferences (via your Profile page) and scroll to the bottom of the page. You can add Categories by beginning to type and then selecting from the dropdown.
To subscribe to a Topic (or thread) go to the topic in question and scroll to the bottom. Just above the Suggested Topics table is a notifications drop-down, from which you select the appropriate option.
The Keyboard Shortcut menu can be accessed by ?
Known keyboard issues
p and = open the Profile and "Hamburger" menus respectively.
The Profile and “Hamburger” drop-down menus can only be navigated by tabbing; j/k and up/down arrow keys do not work.
j/k navigation does not work on the Categories page, or Profile pages (except for Messages).
Smilies / Emoticons / Emoji
Discourse uses the Emoji set of emoticons Hover over the one you want to see its code. Each begins and ends with a colon, with the name between (no spaces). So, for example, if you want to add a smiley face to your post , you can just type
:smiley: or use the emoji picker in the composer window(as shown below).