> You can say black holes are holes in spacetime with a big rock at the bottom.

The more I've thought about this, the more it seems wrong. Black holes are not a hole in spacetime like a puncture hole in fabric. There is no missing spacetime like there would be missing fabric. Black holes are more accurately a round 4D valley in spacetime rather than a hole in spacetime.

>Black holes are not a hole in spacetime like a puncture hole in fabric.

Who said puncture holes? Ground holes also exist you know.

All holes are punctures, including ground holes.

Not really, unless you can find a contrasting definition to one found on WorldReference. Puncture is defined as making a hole in surface (the boundary) rather a volume (the solid). In any case this goes off topic. You've apparently misunderstood what people usually mean with hole. (edit: Or maybe I've. Now I'm confused. Here goes the rest of my day thinking about the meaning of holes.)

There are no holes that puncture the ground. All holes in the ground are, in your terminology, "valleys".

A puncture is a hole, and vice versa. These are synonyms.

How many holes are there in a coffee mug?

Septillions, especially if there's coffee in it.

There kinda is missing space time. Everything inside the event horizon is fundamentally separate from everything outside. It takes an infinite amount of time (from the perspective of an exterior observer) for something to fall into the event horizon, and it is fundamentally impossible for anything inside to get out.