Whose idea was it to show the Blue Screen of Death right after I saved nothing?

My PC displayed a Blue Screen of Death before I had a chance to save my work, and I'm worried about losing data or seeing the crash again. Could someone help me identify the likely cause, explain how to check the stop code and crash logs, and suggest safe troubleshooting steps? I can share my Windows version, hardware details, recent updates, and any error messages that appeared.