Data Structure - an educational app

A data structure is a specialized format for organizing, processing, retrieving and storing data. While there are several basic and advanced structure types, any data structure is designed to arrange data to suit a specific purpose so that it can be accessed and worked with in appropriate ways. This is a data structure offline guide app for the students.
Introduction:
Array
Linked List
Stack
Queue
Binary Tree
Binary Search Tree
Heap
Hashing
Graph
Matrix
A data structure for n elements and O(1) operations
Expression Tree
Evaluating the expression represented by expression tree
Construction of Expression Tree
Advanced Lists
Where is data structure used?
Operations†on†Data Structures
What stack means?
Conclusion
data warehouse structure
list data structure
hierarchical data model
heap in c
product structure tree
product structure
hashtable java
data structures in c