what do you think the universe was like before big bang?

Vast darkness, and a point smaller than an pin head of a pin

Big bang is a theory. Scientists don't know how did the universe started. Just theories. In which 'Big Bang Theory' is the most popular one. I have heard that before big bang, universe existed but everything remained still (I mean not like the expanding universe in today's date). But as the big bang happened, it started expanding.

Probably nothing just a star because a star exploded which formed all gases and stuff.

If big bang was the beginning of the universe it was in particular the beginning of time and thus there was nothing 'before' big-bang because there is no 'before' time.

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