Rotate: A rotate operation will rotate the image either to the left or to the right, depending on whether you do Edit->Rotate Right (Ctrl+R) or Edit->Rotate Left (Ctrl+L)

Edit->Mirror: This operation will reflect the image along the vertical axis, as if you were seeing it in a mirror.

Edit->Flip: This operation will reflect the image upside-down (a reflection along the horizontal axis)

Edit->Resize: This operation will allow you to shrink or expand the image. Note that if you increase the size of an image, it may appear blurry and/or pixelated.

Edit->Crop: This operation lets you discard parts of the image you don't want.