Do you think Bitcoin will become the first world currency for buy and sell ?

Actually, there is a big possibility that bitcoin will become our first world currency which can able to buy some stuffs and can able to sell. However, I think if they want to happen it there many things that need to be done like all governments will allow it and accept and they will also consider it as real money that have value.
it is possible and bitcoin has a good chance for this but bitcoin needs to wait for a while before it's happening because not all country has accepting bitcoin as a legal thing. I think the government still learning about bitcoin so they can accept bitcoin as a new currency for the country and they can use bitcoin like a bridge between real life and the internet life. but right now, I think there is any store online that is already accepting bitcoin as a new payment system so we can still use bitcoin to buy something.