To my surprise, I couldn't find any related official tutorial or guide. However I did get the following html code block and I would like to know how to use it. What should be put at the data-ad-slot=???????
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-xxxxxxxxxxxxxxxx"
crossorigin="anonymous"></script>
<ins class="adsbygoogle"
style="display:block"
data-ad-client="ca-pub-xxxxxxxxxxxxxxxxxx"
data-ad-slot="**********"
data-ad-format="horizontal"
data-full-width-responsive="true"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>