CentOS 6 & 7 forgot the root password modification scheme

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The root password modification of Linux is different from the password modification and retrieval of Windows. The login password of Windows needs to be solved by intervention tools if forgotten. CentOS6 and CentOS7 also have different password methods, as follows:
The practice proves that the following scheme is feasible

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The first is a root password change for CentOS 6
Boot press esc

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Press e to enter edit mode
Choose the Kernel/vmlinz 2.6.32-696 e16... ... Then press e to edit this item

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Once in edit mode, type simple or 1 after quiet and press enter

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Press b to enter single user mode

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Passwd root
Enter the new password twice

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Reboot to restart

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Log in with the new password after reboot
The root password change for CentOS 6 is complete
Below is the root password change for CentOS 7
Boot press esc
Select CentOS Linux (3.10.0-693... Press the e key

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Move your cursor over the line beginning with Linux 16 and find ro changed to rw init=sysroot/bin/sh

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Press Ctrl + x
Enter chroot /sysroot