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I shall presume you are using a dslr.
Probably set for median in all the settings, ie lights, darks flats etc.
Stacking automatically
Leave the cosmetic applications, hot pixel etc alone for the time being, they used incorrectly can butcher your image. If you must use them do a without run first then compare..... Use sparingly
If you have lots of GOOD data you can use an average combine, but median will give the cleanest simple image for a beginner.
Check through your lights list by clicking on each so they are displayed on the screen, cull out the worst, ie badly out or trailed stars etc, use your own judgement, experiment with your best frames and all to see if there's a difference
With this imaging game, more exposures always means a better image..... If you can process it properly
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