What is the meaning of entering emergency mode? Did I lost all of my files?
It usually means something failed while the machine was booting. We would need to see the output that came before that to tell you what it was.
It is highly unlikely that your files are lost.
How can I resolve this?
We need to see why it is failing. Try posting a picture of the screen.
It looks like the file system consistency check for the root filesystem failed.
Put your root password in there. Then when that prompt pops up, type systemctl status --full systemd-fsck-root.service
Type blkid --uuid 58de
Except instead of 58de you need to type that entire identifier shown above that starts with 58de
Then?
Share the result of that command
You need to include the 58de at the beginning.
Try: fsck /dev/sda2
It is up to you.
If you say y, it will do nothing. If you don’t, it will try to fix it but you risk damaging your data.
So by pressing y it will be remain same? Or it will get fixed?
There will be no change. It will abort which means something like “cancel”
You have to answer y to the ignore error questions. I do want to stress that what you are doing is fairly risky from a data loss perspective.