Well, I'll have to you give a quick answer, but you could research it (I would advise looking at the site of William Lane Craig) further yourself. But it would in a way be like this:
God is the maker of the universe. He thereby created time, space and matter. Time and space can only be created from outside time and space itself. Thereby God has to be outside time, space and matter, which opens up the possibility for him to be eternal, while the universe cannot. And as so, be without a beginning.

I would like to, again add to this, that my answer really short. But I'm sure William Lane Craig's website can help further.

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