You won’t have to do or follow anything, just try to find the resemblance between the two languages I’ll use now:

<?php

//this is a comment 

/*
this is another code comment, which will not have any effect on the code. 
Developers use these comments as a reference to know what they have done
in this area, or what they should do! 
*/

//Now this is variable called "text" being set to the value "Hello, World!"

$text = "Hello, World!";

//and now, displaying the value of this variable, this will be the PHP script output

echo $text;

?>

And now.. the same code but using JavaScript

//this is a comment 

/*
this is another code comment, which will not have any effect on the code.
Developers use these comments as a reference to know what they have done
in this area, or what they should do!
*/

//Now this is variable called "text" being set to the value "Hello, World!"

var text = "Hello, World!";

//and now, displaying the value of this variable, this will be the javascript output

document.write(text);