What is a one-sentence summary of the following article?
If you’d like to rotate or flip an entire image, click “File,” then “Open.” Select the image you wish to rotate and click “Open” once more. Navigate to Image >> Image Rotation to view several options for rotation.  “180 degrees”:  Rotates the image ½ of the way around a complete circle. “90 degrees CW”:  Rotates the image to the right (clockwise) ¼ of a complete circle. “90 degrees CCW”: Rotates the image to the left (counter-clockwise) ¼ of the way around a circle. “Arbitrary”: Allows you to specify the angle you’d like to rotate the image. You’ll be able to type the angle (in degrees) as well as the direction (clockwise or counter-clockwise). “Flip Canvas Horizontal”: Flips the entire image as if shown in a mirror (horizontally). “Flip Canvas Vertical”: Flips the entire image upside-down. If you’re not happy with the flip or rotate option you’ve selected, press Ctrl+Z (Windows) or ⌘ Command+Z (Mac) to undo the action. Open the File menu and click “Save As.” Choose a location to which you’ll save your newly rotated image.

Summary:
Open your image in Photoshop. Select a rotation option. Undo your changes. Save the image.