The Dialogs cover a wide variety of situations such as:
Clothes and Accessories,
Marriage,
At the lawyer,
At the Real Estate Agency,
In the Kitchen,
At the Hotel,
About My Life,
At The Zoo, Cinema,
Public Transportation,
Bank and Money, Restaurant menu,
Professions and Work,
Meals of the Day,
At the florist,
German Numbers,
Zodiac Signs,
Auto Mechanic,
An evening at the restaurant, etc.

Some are more complex and suited for Intermediate or more experienced and advanced users, other are more simple in construction and content and recommended for Beginners and Kids.

By studying these dialogues alone or with without a Teacher you can learn Basic German Language Skills: as Read, Pronunciation, Write, Listen, Grammar Rules, Build Phrases, Communicate with others, speak fluently.