why is it easier to open the door by it's handle give reason
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It's simple. You apply same force in each case but torque is different. Torque acting on the hinge is more if the point of force applied is farther from hinge. The moment of force depends not only on the force applied but also the point of action.
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As distance increases, torque increases and so the rotational effect increases. Hence, it is easier to push open a door by holding the knob than by pushing closer to the hinge. To explain it to a child, just explain that it's easier for a force to work when it has some more "space" to move about than, when it doesn't.
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