Display
You don't "print" with JavaScript, but you can display data in several ways.
You can alert something to have it pop-up on the screen.
alert("I will pop up!");
You can write into an HTML element using innerHTML
<p id = "sampleP"></p>
<script type=”text/javascript”>
document.getElementById("sampleP").innerHTML = "I will be inserted in the paragraph above.";
</script>
You can write into something called the console in the browser (we'll talk about this in a bit).
console.log(2 + 3);