You use the simple past ( Jacky visited Gambia ) when you want to state the fact that his visit occurred at a precise moment in the past, no relationship to the present. You'll use the present perfect ( Jacky has visited Gambia ) when there's a relationship to the present. Jacky has never visited Gambia = so far, up to now Jacky has already visited Gambia = at some unkown time from his birth till now Jacky has visited Gambia = so he knows what it's like, he can tell you about it.
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PieanneYou use the simple past (Jacky visited Gambia) when you want to state the fact that his visit occurred at a precise moment in the past, no relationship to the present.
You'll use the present perfect (Jacky has visited Gambia) when there's a relationship to the present.
Jacky has never visited Gambia = so far, up to now