transfer between different account I'm living in Turkey and I bought some bitcoins from here.
If, for example, I have a neighbour in America and he bought bitcoin from a different platform, can I transfer my bitcoins to him? And can he transfer it to me?
Yes, Bitcoins are the same no matter where you bought them, and you can transfer them anywhere you want.

(One thing to watch out for, though, is that Bitcoin Cash is a different currency from Bitcoin, and you can't directly transfer one to the other.)