The week view shows the 7 days of this week, and the first day of the next week.
In each weekday entry you can see:
Today is shown with a yellow background.
Appointments, tasks and journal entries appear as links, and if you click on that link, that item will become the selected item in the Item View. If you click on a link using the right hand button, it will show you a popup menu of common actions that you can perform on that item.
You can switch to look at different weeks using the Calendar menu.