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  The aperture refers to the opening of a lens. This is where the light pass through.
If the opening is wide, more light pass through.

The aperture is measured in f/stops
small f/stop number = large aperture.
large f/stop number = small aperture
depth of field The bigger the aperture, the smaller the depth of field.
Your background will be blurry.

Tip: A small depth of field is good for portrait photography
depth of field The smaller the aperture, the bigger the depth of field.
Your background will be sharp.

Tip: A large depth of field is good for landscape photography
depth of field The aperture influences the depth of field. The depth of field is the amount of your image that is acceptably sharp.
depth of field The smaller the f/stop, the larger the opening in the lens.
More light will pass through the lens and your photo will be brighter
depth of field The larger the f/stop, the smaller the opening in the lens.
Less light will pass through the lens and your photo will be darker
depth of field The aperture influences the brightness of your image.
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  The shutter speed is the amount of time your camera will let light in.

Shutter speed is measured in fraction of a second. For instance 1/4 means a quarter of a second. When the shutter speed is longer than a second, double quotations are added after the number
depth of field The longer the shutter speed, the more motion blur you will have in your image. Moving objects will appeared blurry.

Tip: If you use a shutter speed slower than 1/60 second, use a tripod.
depth of field The faster the shutter speed, the less motion blur you will have in your image. Moving objects will appeared sharp.

Tip: If your image is blurry and you don't want that effect, choose a faster shutter speed
depth of field The shutter speed influences the motion blur of your images. Motion blur is the representation of movements.

if your shutter speed is long, moving objects will be blurry.
If your shutter speed is fast, moving objects will be frozen in their movements and these objects will appeared sharp.
depth of field A slower shutter speed lets more light pass through the lens. Your image will be brighter
depth of field A faster shutter speed lets less light pass through the lens. Your image will be darker
depth of field The shutter speed influences the brightness of your image.
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  The ISO measures the sensitivity of the image sensor to light.

The lower the ISO value, the less sensitive the sensor is. The higher the ISO value, the more sensitive the sensor is.
depth of field When the ISO value is low, there will be less noise in your image because the sensor is less sensitive to light. Your image will be sharp
depth of field When the ISO value is high, there will be more noise in your image because the sensor is more sensitive to light. Your image will be noisy or grainy
noise The ISO influences the noise in your image
depth of field The lower the ISO value, the darker your image will be

Tip: A low ISO value is good for day light photography
depth of field The higher the ISO value, the brighter your image will be

Tip: A higher ISO value is good for night photography
depth of field The ISO influences the brightness of your image

Tip: If your image is too dark and you don't want to change the aperture and shutter speed values, choose a higher ISO

Sources:
https://photographylife.com
https://digital-photography-school.com