Why do things(it may include positive charges or just water kept at height etc) move from Higher potential level to lower potential level Is that a law or there is some special reason behind it...or probably it is just the behaviour of nature
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Differences in potential are defined in terms of the work which can be done by some force. Unless constrained, objects go where that force is pushing them.
R.W. Bird
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It's rather the other way around: because things move in certain ways (the behavior of nature in your words), we define quantities, using maths, that help us describe how they move. The concept of energy, and potential energy, can be applied to so many physics phenomena in a consistent way, but we do not always have intuition about it.
For the examples you quote (electric and gravitational potential energy) the best way to give an explanation with words is through another mathematical concept: the force. We understand that a system moves in the direction of the applied force. The relation between force and potential energy is such that force always points towards lower potential energy.
However this is not general enough regarding the concept of potential energy. For example in thermodynamics, the force does not serve as a link between the potential energy and our human intuition. In that case there is actually a fundamental law of thermodynamics that states that the potential energy of (non-isolated) systems decreases until it reaches the equilibrium.
Albercoc
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