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sometimes it is just luck, anticipation and shooting more photos until you get the expression you wanted to get. sometimes you just don't get it. i find drummers hardest to get right as i want to.

Hi sir. How many ISO and shutterspeed should be used to take a moving object sir? Can you tell me. Because I often fail to aim at moving objects.

hey. there is a lot of factors for that, mostly how fast the object is moving, and for ISO how much light is there. it is a testing thing until you learn to feel it. Try to keep the ISO as low as possible for the shutter speed you need.

this could help
Photography Basics: Learn Manual Mode (tutorial, Part 1)
Photography Basics: Learn Manual Mode, Shutter speed (tutorial, Part 2)
Photography Basics: Learn Manual Mode, Aperture and ISO (tutorial, Part 3)
Photography Basics: Learn Manual Mode - Thinking process (Tutorial Part 4)

Thank you very much sir