What are the main differences between "Modern Standard Arabic" & "Gulf Arabic"?
Modern Standard Arabic (MSA): Written Form

Gulf Arabic (Khaliji/al-lahjat al-khalijiya): Spoken Form

If I only learned MSA, would I be able to talk with Arabian friends?

Question

What are the main differences between "Modern Standard Arabic" & "Gulf Arabic"?
Modern Standard Arabic (MSA): Written Form

Gulf Arabic (Khaliji/al-lahjat al-khalijiya): Spoken Form

If I only learned MSA, would I be able to talk with Arabian friends?

Answer

hi,
Well ,it's better for u to learn the standered Arabic.This way u can comunicate with all arabs not only people from the gulf.Then it will be easy for you to learn the different arabic dielects including the gulf dielect :)

Answer

salaaaaaaaaaaaam.
Yes, when learning Arabic in general can talk to all the Arabs (One language )
Even if different dialects ,learn arabic  i will teach u language khalije
do not worry, my dear friend

Answer

I totally agree with MAIA and i'm commenting just to support the idea.