To aid in framing and composing shots, the PDX-10 has a guideframe that can be activated to assist in placement of objects. The frames vertical and horizontal lines are also helpful when you are trying to line up vertical or horizontal elements in the shot to avoid an undesired slope or tilt.
There are many other concepts that can be used to create visually interesting shots including balance, rhythm, line, texture, form, color and shape. The use of foreground, middle ground and background, internal frames and the use of light are also important. They are beyond the scope of these modules but are worth studying in more detail on your own