there are a few sentences on how to insert a node into a
linkedList,delete a node from a linkedList:
1.insert a node at the beginning of a linkedList:
NewList.Next[NewNode]=Pointer
HEAD=NewNode
2.insert a node into the middle of a linkedList:
NewList.Next[NewNode]=NewList.Next[Pointer]
NewList.Next[Pointer]=NewNode
3. insert a node at the tail of linkedList:
NewList.Next[NewNode]=NewList.Next[Pointer]
NewList.Next[Pointer]=NewNode

delete a node from a linkedList:
1.delete a node from the beginning of a linkedList:
Header=NewList.Next[Pointer];
NewList.Next[Pointer]=-2;
2.delete a node from the middle of a  linkedList:
NewList.Next[Back]=NewList.Next[pointer];
NewList.Next[Pointer]=-2;
3.delete a node from the tail of a linkedList;
NewList.Next[Back]=NewList.Next[pointer];
NewList.Next[Pointer]=-2;
i can't understand the text above. i just copy it from my book. can
someone give me some explanation about the above text. thanks in
advance.