The month view shows the days of the current month.
In each day entry you can see:
Today will be shown with a yellow background. The current month has a white background. Days from the month before and the month after have a grey 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 months using the Calendar menu.