Ok. He said that most of PS4 games work on PS5, but how do we get access to those games? For example God of War. I bought it on PS Store, so do I just need to download it again? What about physical copies of the games? Do we just need to insert the game?

I ask this because they haven't made anything clear about backwards compatibility. The only thing I know is that if I want to play PS4 games I need to pay PS Plus Collection.