How do I wipe my MacBook Air 2013?

How do I wipe my MacBook Air 2013?
How to reset a MacBook Air or MacBook Pro

Hold down the Command and R keys on the keyboard and turn on the Mac.
Select your language and continue.
Choose Disk Utility and click Continue.
Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.

How to reset a MacBook Air or MacBook Pro
  1. Hold down the Command and R keys on the keyboard and turn on the Mac.
  2. Select your language and continue.
  3. Choose Disk Utility and click Continue.
  4. Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.