on the manual modes, you can use the dial to set what exposure you want (+1 or -1 or 0 etc] to make things brighter or darker.
in which case, to make it brighter, you either open up the aperture or keep the shutter open for longer
there are different modes for metering that you should learn to use. for example, if you take a picture of a person wearing a white shirt, you can use the same exact setting and get dfferent results when you focus on the shirt, the skin, or the hair
thats something to keep in mind.
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