The today tab can be used to view your tasks sorted by due date. This can helps you keep track of which tasks are due today and which are due in the future.
Task Indicator
The green checkbox icon indicates that the item is a task.
Overdue Indicator
The yellow triangle with an exclamation inside indicates that the item is overdue. Only tasks can be overdue.
Calendar Indicator
The blue calendar icon indicates that the item is a calendar event. Immediately following the icon, you will see the start time of the even unless the event is an "All Day" event.
Category Date
The category date is used to categorize items by date. The header is twice as big as a normal row and contains a checkbox next to the description. The checkbox can be used to expand and collapse the category.