Am I right if I understand that I was there refers only to the past and I has been there to both the past and the present?
anonymous I has been there That is not possible English.
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anonymousAm I right if I understand that I was there refers only to the past and I have been there to both the past and the present?
I don't see that at all. They both refer to the past. The first states a fact; the second states an experience.