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Rule of thumb with ISO is use the lowest you can for the amount of light available. The higher the ISO the "grainier" the color in the photo.
Not sure exactly what 1028mm means. They use all kinds of size measurements, which all boil down to the same thing: The camera captures light and color data. The bigger the final file size, the more data it has captured and recorded. The more data it has captured and recorded, the more options you have for using it. Small files are OK for video screen viewing because monitors are relatively crude reproduction devices and can't exhibit high detail or nuanced color. Large files are required for making good hard copies because printers can reproduce much higher detail and a wider range of color.
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