There is a way to hack a mac pro even if you have a password. How do I prevent hacking?

My friend can actually hack a mac pro just by restarting it even if you have a password to protect your mac. My mac is curently mavericks.
Steps: 1.When you open a mac with a password in mavericks, click switch user.
            2. After the page loads, click restart.
            3. After the computer shuts down and is turning on again, press command s.
            4. My friend just typed some code and managed to change my password.
            He told me the password and i changed it back, but i wanted to know how to prevent this hack from happening again on my Mac pro.

Don't let anyone use your computer including your friend. It's easy enough to change a password in single-user mode. Just put a master password - firmware password - on your computer to prevent that kind of access. Better yet change friends.
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Firmware Password from the Utilities menu.
     and follow instructions.

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