A small f-stop such as f/2.8, for example, opens the lens so more light reaches the sensor. If you have a wide aperture (opening), the amount of time the shutter needs to stay open to let light into the camera decreases.
Big f-number may be used in landscape photography as it provides depth of field.
Remember it is a reciprocal relation, big number means small opening, small number means big opening.
With big opening you can photograph more details.
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