An aperture ring allows you to set the f-stop directly from the lens as opposed to a camera control dial. Example: Fujinon XF 8mm F3.5 R WR OIS is short for optical image stabilization.
and most Panasonic Lumix cameras have in-body Image Stabilization which can be used with any lens. Prime lenses are, most often, fairly basic in terms of features although, some more expensive ...