It can help a lot understand how notifications work. First, every tile – be it a project, a note or a task item, show you the date of the last update on the bottom left. Depending on the icon, you can understand what kind of update has been made. For example: If the last update to a note was a file attachement, you will see a cloud icon. If the last update was a comment, you will see a speech bubble. This will help you get a quick idea what you are dealing with.