I need to learn React, but do I need to learn it right now?

I'm not sure. A former coworker showed me codesandbox.io code for his React projects and in wondering how to get started I found this which suggests you should update Node and npm and then run these three commands at a command prompt:

1. npx create-react-app my-app
2. cd my-app
3. npm start

Alright, this should spin up a browser pointed to http://localhost:3000/ are therein you will see a page prompting you to change the App.js file inside of the src folder immediately inside of the outermost project folder you just made. I have not gotten to the changes yet. When I look at this file I see:

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
class App extends Component {
   render() {
      return (
         <div className="App">
            <header className="App-header">
               <img src={logo} className="App-logo" alt="logo" />
               <p>Edit <code>src/App.js</code> and save to reload. </p>
               <a className="App-link" href="https://reactjs.org" target="_blank"
                     rel="noopener noreferrer" > Learn React </a>
            </header>
         </div>
      );
   }
}
export default App;