Take out the trash: On a Mac, hold down Cmd + Shift, then press Delete. Boom, your trash can’s empty. On Windows, you’re better off right-clicking and selecting Empty Recycle Bin.
Erased forever: Files in your trash are still sitting around. To permanently delete a file on Windows without sending it to the Recycle Bin, hold Shift + Delete. On a Mac, select the file, click File from the menu bar, then hold the Option key. Watch as the “Move to Trash” option magically changes to Delete Immediately.