Fishing through other posts at this forum I came across -
How to free space from /dev/nvme0n1p2?
where BigO shared this -
This was the issue that I was having and a folder with my files that had multiple pdfs and some videos. I removed the linux-image-6.8.0-40-generic until 50, and kept the newest one. For the unsigned files, they were removed automatically as well. The OS still didn't boot properly. After restarting with the power button, holding shift, selecting the advanced option to boot (not the recovery option), holding down alt+control+f2 or f1 (a cs buddy of mine told me about this), I was able to launch the OS as a safe graphics mode I assume where I was able to access only the terminal and remove the folder with the most memory on it. Hope that my reply helps people with the same issue and thank you for your help Aravisian.
I gave a try at the holding of Shift+Alt+Ctrl+F2 and it got me to -
Advanced Options for Zorin! There seems to be 2 choices -
Zorin w/Linux 5.15 generic
Zorin w/Linux generic recovery mode
Played with the options and did manage to remove some unused files, but still will NOT boot. I have looked at the "Minimal BASH-like line editing" site linked in a reply by Aravisian, but am overwhelmed by HOW TO? (can I?) 'repair' the Grub on my laptop. When I typed "boot USB" in at grub> the reply was I 'needed to load kernel first'.
Thanks one and all for your helpful hints and suggestions! So far no joy, but I also continue to play around with new to me key combinations and what screens I can get to.