I want to thank @vasileios for his guide and video for setting up a Nextcloud server. I was able to successfully setup up a server at my home by using only his guide and video. Now, it was not without issues, but, I was successful. I had the server successfully running and then I made some changes and then browser was giving me security errors about possibly being hacked and something about about the certificate (I knew I wasn’t being hacked) and I could no longer reach my server.
I was in a panic because I did not do the Timeshift backup and I thought I was going to have to re-do the entire process. I reversed everything that I did after page 25 of the guide (just before the bonus material). I was still having issues. But, I discovered one change that I did not remove: ‘default_phone_region’ => ‘US’,. Once I removed this line, everything went back to normal and I could now access the server.
But, I must confess, there was an issue with the line and the issue was a typo. Instead of typing =>, I typed ==> which caused the entire collapse of the security.
Even though I did not understand the error message that was presented by the browser, I was able to slow down and think about what changed and saved myself hours re-installing the OS, setting up the server, installing Nextcloud, etc.
Thanks again for the helpful guide and for all of the various teachings and training that you provide.