This is a good tutorial but there are quite a few discrepancies in it that make it a little confusing. Like places where it points to the wrong file and case differences like App.js and app.js. If you could fix these problems this would be a great resource!
import MainComponent from "./components/App.js";
..and for the code you have above for the UserList component:
export default class App extends React.Component
valery sntx
retaining the restraint but refocusing the momentum
Nice! Worth of checking is yeoman app generators, look for react-redux-universal, for example, as a base starter kit for fast redux experiments.