When you open your Discuss app. There you'll see on the left side is the Inbox, Starred, History, and Channels and Direct Messages.
Follow a discussion thread
In Odoo, you can keep track of virtually any business object, Opportunity, quotation, task, etc. by following it.
Choose events to follow
You're able to choose which types of events you want to be notified about. Below you can see an example that shows options available when following a task in the project app.
You can invite other users and add channels as followers. by adding a channel as a follower will send messages posted in the chatter to channel including a link back to the original document.
Be a default follower
You are automatically a default follower of any item you create. In some applications like CRM and Project, you can be a default follower of any new record created to be notified of specific events like a new task created or an opportunity won.
You're all set. Make the most of Odoo Discuss app!