Downloading

Step 1: Downloading Debian GNU/Linux

First we'll need to download the installer, go to https://www.debian.org and download the netinstaller iso

Figure: https://www.debian.org
Debian GNU/Linux project page with download link to the net-installer ISO

I will assume that you'll be installing Debian from a USB thumb drive and that the latest versions of all the software will be downloaded during the installation process.

For this to be possible you'll need a network adapter that's compatible with Linux (most wired adapters will work), the Broadcom WiFi chip used in devices like the MacBook Air (for example) will not work since it requires a non-free firmware and driver (available in Debian's non-free repository but you'll need to install it post install). An alternative for such devices is a USB LAN adapter like a sitecom LN-032. If you don't have a working network adapter available during installation, you can use the CD or DVD sets (downloadable ISO files) to install Debian, but the downside of this is that you'll be downloading a lot more, not everything will be installed and it's possible the software on those CD/DVD sets might not be the most recent versions.

The reason for the net-install as installation medium is that it will only download the files needed depending on the setup you choose (Desktop or Server for example) and with the exception of a few packages (like the Kernel) it will download the most recent versions during installation so no need to go upgrading a large number of packages right after you have installed Debian.

So download the net-installer ISO (top right of the Debian homepage).

After downloading the ISO it's time to burn it to a USB thumb drive, continue to Step 2: Burning to USB.