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There are some other cases (or are they cases, I dunno) used only in special contexts.

в аэропортУ - at the airport
дай мне хлеба - give me bread

But yeah, they're negligible compared to the...

To get an idea of what it is, think of English:

He sees her. correct
He sees she. wrong

She sees him. correct
Her sees he. wrong

His book. correct
He book. wrong

Are you talking about examples?

У меня есть ресторан - I have a restaurant.
У меня нет ресторана - I don't have a restaurant.
Мы направились к ресторану - We headed for the restaurant.
за...