Microsoft Teams now allows you to pin Channel, making it easier to define your favorites channels.
To start using it, just open your Teams client and open the contextual menu of the channel you want to pin to choose Pin
Once a channel is pinned, it will then be displayed below the new Pinned section
To remove a channel from the pinned list, just repeat the same and choose Unpin or choose Unpin from the the contextual menu of the channel in the Pinned list