I think I may be able to explain the difference trough examples:
"If I were rich I would travel to Italy."
"I'm rich, I have no lack of money, and I wanna go to Italy. So, I will travel to Italy"
"If we were in the same country we would meet at a coffee place."
"As we aren't in the same country we will not meet face to face, only through the internet".
I hope this clarifies the subject at least a little to you.