Sorry but how did the big bang happen? everything came from nothing? an explosion created something? makes no sense
You didn't watch the video, did you? Nor have you read anything written by a scientist about the "Big Bang" have you? If you had done either of those you would have known the Big Bang was neither an explosion nor a big bang. Those terms only have meaning if you can define them with respect to the universe when they occurred. Science can't do that because according the the "Big Bang" hypothesis the universe had not taken on any form at t=0. All that aside, the "Big Bang" is not the only guess at what happened.
As Hossenfelder clearly stated, we don't know where the universe came from. The "Big Bang" (with the above caveats) is just a working hypothesis on it's evolution and nowhere in that hypothesis does it claim what happened to initiate t=0 except that it is hypothesized the current space and time we call the universe came into existence during that event. We don't know what existed before that or what form it took nor do we make any claims along those lines
It is the religious nut bags that believe that some magical monkey wiggled his finger and the universe popped into existence out of nothing and was fully formed in 6 days. That is NOT what mainstream science thinks, it is religious bunk.