You can change your root password on several ways, if you forgot it.

The short way

sudo su

passwd

or

sudo passwd root

Or the long way

Restart the system: Restart the system or switch it on.

GRUB menu: Press a key (e or c) during the startup process to edit the GRUB startup menu (the boot loader).

Edit boot parameters: Find the line that starts with linux or linuxefi. Add a new parameter at the end of this line. In the past, this was often single or init=/bin/bash. Today, rd.break or rw init=/bin/bash is often used to put the system in a state where you can obtain a root shell without a password.

Remount the file system: In some cases, especially with the rd.break parameter, the file system is mounted as read-only. Before you can change the password, you must remount it in read-write mode:

mount -o remount,rw /sysroot

chroot /sysroot (to switch to the “real” system environment)

Change password: Now you can run the passwd command to change the root password: passwd.

Restore SELinux context: If you are using SELinux (which is standard in Fedora), you must create a file called .autorelabel. This ensures that SELinux correctly adjusts the file permissions after the reboot so that the system does not fail.

touch /.autorelabel

Restart the system: Finally, restart the system, usually with reboot -f or exit followed by exit.