how to create component in reactjs

1class MyComponent extends React.Component{
2    constructor(props){
3        super(props);
4    };
5    render(){
6        return(
7            <div>
8              <h1>
9              	My First React Component!
10              </h1>
11            </div>
12        );
13    }
14};
15

1class Car extends React.Component {
2  render() {
3    return <h2>Hi, I am a Car!</h2>;
4  }
5}

1// This is a fancy react component, For Demo purposes
2const SiteIntroduction = () => {
3  return (
4    <React.Fragment>
5      <section>
6        <header>
7          <h1>Component Header </h1>
8        </header>
9
10        <main>
11          <p>
12            This is a paragraph for my Entire Component that i am using in the
13            application
14          </p>
15        </main>
16
17        <footer>
18          <p>This is the Entire Footer for The React Component Application</p>
19        </footer>
20      </section>
21    </React.Fragment>
22  );
23};
24
25ReactDOM.render(<SiteIntroduction />, document.getElementById("root"));
26

1const element = <div />;