We don't know that the universe was truly created. The concept of things being "created" is something us humans came up with (usually meaning existing atoms are shifted into place for us to then recognize them as a certain object).

We have never observed anything in the universe just popping into existence from nothing, so the least speculative theories assume that the universe did not either pop into existence from nothing.

We do have evidence for the Big Bang, but it's not the creation of the universe, it's rather just the expansion of space (and is still occurring today). Before the Big Bang, the universe must've taken place in a more contracted space, but we don't know what that means in effect.

You could also apply our imprecise human definition of the universe being "created" to mean that everything existed beforehand and it just got shifted into the recognizable universe we know today. That is something the Big Bang did do. I'm really not a fan of that, though, since it obviously confuses people.

Here's a video explaining the Big Bang in more detail: https://tilvids.com/w/9kRqDF9pXrDFprLiAG1hAr
(Unfortunately, the guy does talk of the universe being 'created' at the beginning of the video. Near the end is a more precise definition.)