oem@Chris ~ $ sudo apt update
E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
Can anyone explain what this means and how to fix it??
I was following this guide On making a bootable Win10 usb and got that error.
I'm mostly just confused because isn't that the command to update the whole computer?
Sounds like you already have an instance of apt runnning. Check any other terminals and whether maybe your system is automatically searching for updates. If you can't find anything just restart the machine.
Try
sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update
That sounds like a bad idea if another instance of aptitude is indeed running.
Indeed, but your post was first 
btw ps aux | grep apt
should list apt processes.