Then there is learning skills.

There is also the study of buying recipes.

Some recipe materials are not available.

For example, sushi needs fish.

You must go fishing. . .

And hamburgers and things like that. You must cook them in the oven.

Use fish

You buy an outdoor barbecue (a big black pot)

You can eat grilled fish directly.

You can cook dishes and fish in your backpack.

But people who have nothing in their backpacks can't do it.