First we need to download Debian ISO from here: download
{% embed url="https://www.debian.org/download.en.html" fullWidth="false" %} This is a direct link to debian.org/download. {% endembed %}
{% hint style="info" %} ISO file: it's a type of disk image file used to replicate the content and structure of a physical disk, like a CD, DVD, or Blu-ray disc, in a single file. {% endhint %}