Messages - These are user posts in the forums. Discussions - This refers to threads Conversations - These are private messages. You can access your conversations via the drop-down menu on the top right-hand side of the navigation bar. You need to click on your username to open the menu page. Watched Forums and Watched Threads - These are your "bookmarked" forums and threads. You can mark forums and threads that you wish to ‘watch’ or follow to get notifications if there have been any new posts or threads in the forums and threads that interest you. Alerts - You'll see an 'alerts' menu at the top right of the page when you're signed in. Here you'll see notifications on threads and forums you're watching.