What if all of a sudden our sun just vanished. Pouff Just like that we lost our sun.

First of all, that would for sure cause some problems in our solar system because obviously well the main element is no longer there. The organization of the planets would change completely if not auto-destruct.

On planet Earth, everything would freeze and the lack of light would be fatal for all beings. Unless the disappearing of the sun was anticipated therefore researchers and scientists worldwide would have created some sort of protective bubble around the world that would provide us with light and warmth to survive. The first of generations of humans that would live through the transition would have a lot of health issues due to the big change of environment. But through out the years and successive generations, all beings would adapt and it will have become our new normal.