Although in Portuguese these two forms mean the same thing, "ter", there is a slight difference between them.
When you are talking about something that simply exists, without attributing property, you should use there is/are.
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Ex: There are some people in the room. (these people don't belong to the room, they're just in there)
There is a boy playing in the park. (the boy is not a property, he is just using the space)
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When you are talking about things that have a relation with each other, you should use have/has.
The park has a guard. (although the guard is not a property, he has a relation with the park)
The house has four bedrooms. (Not only am I describing the house, I am telling you about its features)
Was it clear? :))
