Problem installing React. What's wrong?

Question

Node.js

I have installed React via npm (npx create-react-app my-app) several times, and it uploads node_modules and the package.json file to my folder and that's it.
package content:

{
  "name": "my-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.3.0"
  }
}

Answer 1

Write these 2 commands:
After installation
The first command will most likely have to be executed with sudo