How to delete all my files from my Mac?

Can anyone help me, how do I delete all my files from my Mac?

If you want to eventually sell or give away your Mac, follow the below steps to prepare it.
If your old Mac shipped with Lion or Mountain Lion, boot into Internet Recovery by holding down Cmd-opt-r on restart. When it boots, select Disk Utility and erase the Macintosh HD volume, then reinstall the OS. It will install the OS the Mac shipped with.
If it shipped with Snow Leopard, boot from the original install disk and select Disk Utility from the Utilities menu which you will see after selecting the Language. From there, select the Hard drive device (top of the list), and click on the Partition tab. Set it to 1-partition, give the new volume a name (Macintosh HD), and click Apply.
If you just want to get rid of the data off the Mac, create a new Admin user account, log into it, then delete your user account from the Users & Groups system Prefs. It will ask if you want to keep or delete the home folder.

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    F:     removable_drive  0000-0000 
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