Mac Restart/Partial Reset?

Okay, so my Mac (MacBook Pro 14" late 2021) just about gave me a heart attack. I was uninstalling Xcode beta and was going through Terminal to clean up any residual files when it started giving me an iCloud connection error. I think to myself, OK, I'll just sign back in. For some reason, Terminal had erased my passwords, so I decided to restart the computer. Only when I did this and the computer turned back on, it started going through part of the new Mac setup process. At this point, I thought that I'd lost everything. I went through the setup process only to find that while all my files were intact, all of my applications were signed out and I had to manually sign back in to everything. Also, personalization settings were reset to factory version.