> Most people have no idea how to hunt, make a fire, or grow food. If all grocery stores and restaurants run out of food for a long enough time people will starve.

I doubt people would starve. It's trivial to figure out the hunting and fire part in enough time that that won't happen. That said, I think a lot of people will die, but it will be as a result of competition for resources.

People would absolutely starve, especially in the cities.

It’s just not possible to feed 8 billion people without the industrial system of agriculture and food distribution. There aren’t enough wild animals to hunt.