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The JavaScript code can be kept into html page inside <script> tag.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>
</head>
<body>
<p style="color:red">Hello world using HTML!</p>
<script>
document.write("<b>Hello world using JavaScript!</b>");
</script>
</body>
</html>
Above code snippet, shall write the text in inverted comma on the page in bold style.
Note that <script> block ideally should be written inside the <head></head> block however it can be kept anywhere inside the <body></body> tag also.