Debian is a fantastic linux distrubution that works, and rarely causes issues. Due to this, it is a common canditate for a server OS, and is what this guide will walkthrough how to install on a PC.
Assumptions
You have a PC/laptop with an internet connection
You have a PC/laptop/VM to install Debian to
You have a USB that can be rewritten with the debian ISO
You're on a network with DHCP (the typical home network will be)
Currently assumes you boot via BIOS, not UEFI (Will be updated for UEFI too)
Download and Burn the ISO
Boot from the USB
Start install
Localisation
Network, and server name
Create User
Disk Partitioning
Preferences
Skip Swap (for now)
Scan Additional Media
Unless you've addition drivers, etc. (You probably don't) hit No
Configure Mirror
Popularity Contest
Software Selection
Install Grub Boot Loader
Reboot, and enjoy!
Setup Swap
Next steps
Now that you've got a basic Debian install, you'll need to configure, and install a few things. I've written a little something, somthing like that, so check how to setup a new server install