Create React app with TypeScript

Run the following command.
$ npx create-react-app my-app --template typescript
After finish the creating process...
$ cd my-app
$ npm start
Simple.
What's next...?
It was really easy to create an application.
Then, What I should do next?
I am not a designer, so I would like to develop a website as easy as possible.
Maybe Material UI is the best library for people like me?
Let's install it.
$ npm install @mui/material @emotion/react @emotion/styled
And I also want to use cool icons.
$ npm install @mui/icons-material
Then, just comment out the code on src/App.tsx and add Button (Also add a style to the button on src/App.css).
After just saving the code.
Awesome. How about a header?
The official website shows how to add a header named AppBar.
I just copied the code.
import './App.css';
import { AppBar, Button, IconButton, Toolbar, Typography } from '@mui/material';
import { Box } from '@mui/system';
import MenuIcon from '@mui/icons-material/Menu';

function App() {
  return (
    <Box sx={{ flexGrow: 1 }}>
      <AppBar position="static">
        <Toolbar>
          <IconButton
            size="large"
            edge="start"
            color="inherit"
            aria-label="menu"
            sx={{ mr: 2 }}
          >
            <MenuIcon />
          </IconButton>
          <Typography variant="h6" component="div" sx={{ flexGrow: 1 }}>
            News
          </Typography>
          <Button color="inherit">Login</Button>
        </Toolbar>
      </AppBar>
    </Box>
  );
}

export default App;
Then...
Great!
It seems too easy to develop a website using those components...

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Create React app with TypeScript