How do space and time swap their physical roles inside a black hole's event horizon?

How do you think about the reality at a place where the curvature of space-time is infinite??

Why did Einstein believe that black holes can not exist in reality, even though he praised the mathematical model?

What's the meaning of the phrase 'Black holes don't have any hair'?

2 follow-ups

What causes the rotation of a black hole? how many rotational black holes are out there in proportion to non-rotating ones?

When did the four fundamental forces separate after the big bang? and how and why??