<script data-ad-client="ca-pub-8338866757008397" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
Where I can post this as required by Ad Sense
<script data-ad-client="ca-pub-8338866757008397" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
Where I can post this as required by Ad Sense
<html>
<head>
<script data-ad-client="ca-pub-8338866757008397" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<title>Your Title</title>
</head>
<body>
This is the body of your page.
</body>
</html>
As they mentioned in the document of AdSense, After you've generated the AdSense code, you need to paste it between the and tags of your site.
https://support.google.com/adsense/answer/9274516?hl=en
<html>
<head>
<script data-ad-client="ca-pub-1234567890123456" async
src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js">.
</script>
This is the head of your page.
<title>Example HTML page</title>
</head>
<body>
This is the body of your page.
</body>
</html>