You should check out PBS Space Time on YouTube then

I love Brian; he is a pillar of the physics community. However, in the interest of time, he only got into Hawkin's shuttlecock interpretation.

There are others such Paul Steinhardt Eternal Inflation, and the universe being born out of black/white hole as described in the Penrose diagrams.

General relativity math is solid, but no one really knows how to interpret the singularity (if there is such a thing).