Dear Rahul,

Norton's theorem states that it is to simplify any linear circuit into an equivalent circuit with just a single current source and parallel resistance connected to load.

KCL theorem states that the total current or charge entering a junction or node is exactly equal to charge leaving the node.

KVL theorem states that  in any closed loop network the total voltage around the loop is equal to the sum of voltage drops within the same loop.

I hope you got the required information