It was in his initial post. I noticed because I have the same Pi. Mine works great. Both of them.
But, I do get an under-voltage report every time I restart either the OS or Octoprint.
In my case that's caused by hanging too many plugs off the same extension cord... I'm in an unfinished office without any outlets (yet).
I've used Linux for over 25 years as my primary OS for both desktops and laptops, at home and work.
syslog, and others, are in /var/log.
There will also be a log file called dmesg. That's also a command that can teach you other information.
Check for a boot log named boot.
Learn how to use ssh. If you're coming from a Windows PC, get putty and learn how to use it. If you're on a Mac, learn how to use the terminal and ssh from the CLI (command-line interface).
You can get a nice log reader called glogg. Figure out how it's used.
First, become super user (root), then run:
apt install glogg
Have fun, and remember, when you get to a point where you're stuck, Duck Duck Go is your friend.