(2) Unlike other data structure, it focuses on 'representation' instead of saving & delting datas.
(3) Binary Tree

(4) Binary Tree
- Binary Tree Node Structure

- Making Binary Tree Node

(5) Hmm.. I understood we made a Binary Tree "Node" , but where is the Binary Tree Structure?
Yes.. the struct "BTreeNode" is representation of node, AND
is also representation of binary tree structure.
Why ?
The node that has no child is also tree structure!
Because it has empty set as its child.
Like this :

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