It is mandatory for each React component to have a render() function.
Render function is used to return the HTML which you want to display in a component.
If you need to rendered more than one HTML element, you need to grouped together inside single enclosing tag (parent tag) such as <div>, <form>, <group> etc.
This function returns the same result each time it is invoked.
import React from 'react'
class App extends React.Component {
render (){
return (
<h1>Hello World</h1>
)
}
}
export default App