camera movement
use slow zooms and handheld shaky camera to build tension.
camera angle
close-up on faces or objects to show detail
lighting
low key and high contrast lighting and shadows to create mystery or danger
obscure
deliberately obscure parts of the screen with shadows to create uncertainty.
P.O.V
show the scene from the characters perspective so the audience identifies with them creating fear.
paralel editing
cut to different scenes that are happening at the same time, creating anxiety about what will happen when they intersect.