Ans: to the Ques: No.1
We need to change the pointer variable name temp when we create new node because the compiler will take the latest name of variable thats why we change the variable name when creating a new node in the linked list.

Ans: to the Ques: No.2
The meaning of a null to the address part of a node indicates that the node is not linked up with any other node next to it. This node will not point to any next node.The node is the last node and not linked with any node.