Is there a center of the universe and how could the universe be infinite?

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According to Wikipedia, the universe “may” be infinite. I don’t understand.

If there was a Big Bang, if the universe expanded from a single point, How could the universe be infinite? There must have been a finite amount of matter/energy in that single point.

And how could there not be a center of the universe? I get that “everything is expanding away from everything else” but shouldn’t everything ALSO be expanded away from the center point where the Big Bang occurred?