Debian -- Getting Debian
https://www.debian.org/distribYou can install Debian (on as many machines as you like) without downloading all packages yourself. The CD can be used to more easily rescue a damaged Debian system. Buy a computer with Debian pre-installed. There are a number of advantages to this: You don't have to install Debian. The installation is pre-configured to match the hardware.
Debian -- Live install images
https://www.debian.org/CD/liveInstaller: Starting from Debian 10 Buster, the live images contain the end-user-friendly Calamares Installer, a distribution-independent installer framework, as alternative to our well known Debian-Installer. Size: Each image is much smaller than the full set of DVD images, but larger than the network install media.