1-)We use the Present Perfect Tense to talk about an action which started in the past and continuous up to now.
-I have been a teacher for more than ten years.
-We haven't seen Janine since Friday.
2-)We use the Present Perfect Tense to talk about experiences. It is important if we have done it in our lives or not. It is not important when we did it.
-I have been abroad two times.
-Have you ever eaten sushi?
Tip! We often use never and ever with the Present Perfect Tense to talk about experience.
3-)We also use the Present Perfect Tense to talk about a past action that has the result in the present.
- I have lost my wallet. = I don't have it now.
-Jimmy has gone to South America. = He isn't here now.
I hope,I could help you:)