How to write comments in ReactJS ?

import React, { Component } from 'react';
  
// This is a comment
  
class App extends Component {
  
    /* This is 
    also a comment*/
    render() {
        return (
            <div>
                <h1>Welcome to Kaashiv</h1>
            </div>
        );
    }
}
  
export default App;

import React, { Component } from 'react';
  
class App extends Component {
    render() {
        return (      
            <div>
                // This is not a valid comment
                /* Neither is this */
  
                { /* THIS ONE IS A VALID COMMENT */ }
}
                  
                <h1>Welcome to Kaashiv</h1>
            </div>
        );
    }
}
  
export default App; 

import React, { Component } from 'react';
  
class App extends Component {
    render() {
        return (     
            <div>
                <!-- This is not a valid comment -->
                  
                {/* THIS ONE IS A VALID COMMENT */}
                  
                <h1>Welcome to Kaashiv</h1>
            </div>
        );
    }
}
  
export default App;