DEPTH OF FIELD. Larger apertures and below) correlate to a shallower DOF whereas small apertures and above) will render almost the entire frame in focus. DOF is effected by two things: aperture and the distance between subject and background.
5 Essential Infographics For The Beginner Photographer
I have a journal that I kept when I started to learn photography. The pages are scribbled with notes and diagrams made while I was trying to grasp the basic functions of my camera. The camera manual could've been written in Greek for all.