How to load linuxcnc

I have a new pc to control my router. Which version do you recommend and how do I get it onto a USB stick to load it?

Thanks
Paul

Use the ISO 2.8.2 the current stable:
linuxcnc.org/downloads/

download and install to bootable USB

there are about 3x ways to create a bootable usb from an ISO (google is your friend.... / GIYF)

download and install and run / follow prompts to ISO and USB drive you wish to flash.
www.balena.io/etcher/
OR:
rufus.ie/en/
OR (if you are running Linux):
linuxiac.com/how-to-create-bootable-usb-drive-using-dd-command/
use DD with caution..... its not called DISK DESTROYER for no reason.....  Only applicable on a linux machine

may need to go into the bios and make the USB drive bootable, depending upon what bios you have it can be a different button..... try repeatedly pressing F2, DEL or F10 at the time of booting, if it fails using one button, reboot and try pressing another (DEL + F2 I think have always worked for me for ~20 years)

Then follow the prompts to install..... you may benefit from running the live ISO first so that you can set and test your latency. and also make changes to your bios settings (turn off hyperthreading, C-states, all power saving options and other speed enhancing features that mask the real pc processor performance (you want a stable repeatable and consistent timing for the realtime OS).

Not sure what hardware you are intending to run, but MESA ethernet stuff is serving me well.

Good luck, have fun + try to search google / the forum first + READ the documents...
linuxcnc.org/documents/