TicTacToe/src/App.js

import './App.css';

function Square({ value }) {
  function handleClick() {
    console.log('clicked!');
  }

  return ( 
    <button 
      className="square"
      onClick={handleClick}
    >  
      {value}
    </button>
  );
}

function App() {
  return (
  <>
  <div className="board-row">
    <Square value="1"/>
    <Square value="2"/>
    <Square value="3"/>
  </div>
  <div className="board-row">
    <Square value="4"/>
    <Square value="5"/>
    <Square value="6"/>
  </div>
  <div className="board-row">
    <Square value="7"/>
    <Square value="8"/>
    <Square value="9"/>
  </div>
  </>
  );
}

export default App;