Exposure describes the amount of light recorded, but lighting describes the relationship between areas of a scene. A face can be bright against a dark room, evenly lit against a bright background, or shaped by a narrow strip of illumination. Start by asking what should receive attention and what can fall away.
Direction and size
Light from the side reveals texture and shape. Frontal light reduces shadows and can feel direct. Backlight creates separation and may produce silhouettes or flare. Light from above can create strong eye sockets and texture; lowering or diffusing it often produces a gentler result.
A large source relative to the subject produces softer transitions. A small source produces harder-edged shadows. The sun is enormous but can behave like a small source on a clear day because it occupies a small part of the sky. Cloud cover, shade, a window curtain or a translucent panel can enlarge the apparent source.
Natural light
Windows are controllable sources when you adjust distance, angle and diffusion. Move the subject rather than immediately moving the camera: a step toward the window changes contrast and a step away reduces the light level. Use a pale wall as a reflector, a dark surface as negative fill, or a curtain to soften direct sunlight.
Outdoor light changes with time, weather and surroundings. Photographing in open shade can provide smoother skin tones, while a bright sky behind the subject can create a dramatic rim. Watch the background exposure; a beautiful subject light can still fail if the brightest area pulls attention away.
Artificial light
Continuous lights show their effect immediately and are useful for video or careful still-life arrangements. Flash provides more power for its size and can freeze movement, but it asks you to learn triggering, sync and recycling behaviour. A speedlight can be bounced from a pale ceiling or wall for a larger apparent source. Direct on-camera flash is efficient but often gives flat light and hard shadows.
Modifiers matter because they change source size and spill. A softbox gives direction and diffusion, an umbrella spreads light broadly, and a grid narrows the beam. Flags and black cards are as useful as extra lights because they prevent unwanted bounce. Buy one controllable light, one stand, one diffuser and a way to secure the setup before adding complexity.
Exposure and colour
Keep shutter speed, aperture and ISO connected to the subject. If movement matters, protect shutter speed first; if depth matters, protect aperture first. When mixing sources, compare colour temperature and decide whether the difference is intentional. Shoot a reference frame or use a neutral target when colour consistency matters.