I am new to reacting to my native language, and I had problems understanding the folder structure of the application, which should be supposed to be present in the project folder when I created it. Basically, when I create a project with npm, I get several startup files (App.js, etc.) and a node_modules folder. I got it and worked with expo, which also created the .expo folder.
However, when I go to the official documentation or look at plugins / add-ons on git, they talk about the android and iOS folder in the root of the project several times. But they are nowhere to be seen. Then I got some tips that I could install and run response-native-upgrade- git, which would presumably generate these missing folders. But that didn't work either.
So what did I miss? Where are these folders located?
Edit: here is a screen dump from a Youtube tutorial showing the structure of the project I'm looking for:

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