diff --git a/Data_Structure/README.md b/Data_Structure/README.md
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diff --git a/Data_Structure/requirements.txt b/Data_Structure/requirements.txt
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+
+pytest
+mypy
+flake8
diff --git a/Data_Structure/src/__init__.py b/Data_Structure/src/__init__.py
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+++ b/Data_Structure/src/__init__.py
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+
+from .stack_reverse import reverse_string
+from .queue_with_stacks import QueueWithStacks
+from .linked_list_max import LinkedList
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diff --git a/Data_Structure/src/linked_list_max.py b/Data_Structure/src/linked_list_max.py
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+++ b/Data_Structure/src/linked_list_max.py
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+class Node:
+    """Represents a node in the LinkedList."""
+    
+    def __init__(self, data):
+        """
+        Initialize a node with data and a reference to the next node.
+        
+        Args:
+            data (int or float): The data to be stored in the node.
+        """
+        self.data = data
+        self.next = None
+
+class LinkedList:
+    """LinkedList class to manage the linked list operations."""
+    
+    def __init__(self):
+        """Initialize an empty LinkedList."""
+        self.head = None
+
+    def append(self, value):
+        """
+        Append a new node with the given value to the end of the list.
+
+        Args:
+            value (int or float): The value to be added to the list.
+        """
+        new_node = Node(value)
+        if not self.head:
+            self.head = new_node
+        else:
+            current = self.head
+            while current.next:
+                current = current.next
+            current.next = new_node
+
+    def find_max(self):
+        """
+        Find the maximum value in the linked list.
+
+        Returns:
+            int or float: The maximum value in the linked list.
+
+        Raises:
+            ValueError: If the list is empty.
+        """
+        if not self.head:
+            raise ValueError("The linked list is empty.")
+        
+        max_value = self.head.data
+        current = self.head.next
+        
+        while current:
+            if current.data > max_value:
+                max_value = current.data
+            current = current.next
+        
+        return max_value
+
+    def print_list(self):
+        """
+        Print all the values in the linked list.
+
+        Returns:
+            list: A list of all values in the linked list.
+        """
+        values = []
+        current = self.head
+        while current:
+            values.append(current.data)
+            current = current.next
+        return values
+
+
+if __name__ == "__main__":
+    ll = LinkedList()
+    ll.append(5)
+    ll.append(10)
+    ll.append(25)
+    ll.append(65)
+
+    # Print all items in the linked list
+    print("LinkedList items:", ll.print_list())  # Output: LinkedList items: [3, 1, 4, 2]
+
+    # Find and print the maximum value
+    print("Maximum Value in LinkedList:", ll.find_max())  # Output: Maximum Value in LinkedList: 4
diff --git a/Data_Structure/src/queue_with_stacks.py b/Data_Structure/src/queue_with_stacks.py
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+++ b/Data_Structure/src/queue_with_stacks.py
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+class QueueWithStacks:
+    def __init__(self):
+        """
+        This class implements a queue using two stacks. The enqueue operation is performed on stack1,
+        and the dequeue operation is performed on stack2. When stack2 is empty, elements are transferred
+        from stack1 to stack2 to ensure the correct order of elements.
+        """
+        # Initialize two stacks: stack1 for enqueue operations, stack2 for dequeue operations
+        self.stack1 = []
+        self.stack2 = []
+
+    def enqueue(self, x: int):
+        """
+        Adds an element to the back of the queue.
+
+        Parameters:
+        x (int): The element to be added to the queue.
+
+        Returns:
+        None: This method does not return any value. It modifies the queue by adding the given element.
+        """
+        # Push the element onto stack1
+        self.stack1.append(x)
+
+    def dequeue(self) -> int:
+        """
+        Removes and returns the front element of the queue.
+
+        The dequeue operation is performed on stack2. If stack2 is empty, elements are transferred
+        from stack1 to stack2 to ensure the correct order of elements.
+
+        Raises:
+        IndexError: If both stacks are empty, indicating that the queue is empty.
+
+        Returns:
+        int: The element at the front of the queue.
+        """
+        # If both stacks are empty, raise an IndexError
+        if not self.stack1 and not self.stack2:
+            raise IndexError("Dequeue from an empty queue")
+
+        # If stack2 is empty, transfer elements from stack1 to stack2
+        if not self.stack2:
+            while self.stack1:
+                self.stack2.append(self.stack1.pop())
+
+        # Pop the element from stack2 (which is the front of the queue)
+        return self.stack2.pop()
+
+    def __str__(self):
+        """
+        Returns a string representation of the queue's current state.
+        
+        If stack2 is not empty, it represents the front of the queue in reverse order. 
+        Otherwise, stack1 represents the back of the queue.
+        
+        Returns:
+        str: A string representation of the queue.
+        """
+        if not self.stack2:
+            return str(self.stack1)
+        return str(self.stack2[::-1] + self.stack1)
+
+# Example usage:
+if __name__ == "__main__":
+    q = QueueWithStacks()
+    q.enqueue("Lesson1")
+    q.enqueue("Lesson2")
+    q.enqueue("Lesson3")
+    print(q.dequeue())  # Output: 1
+    print(q.dequeue())  # Output: 2
diff --git a/Data_Structure/src/stack_reverse.py b/Data_Structure/src/stack_reverse.py
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+++ b/Data_Structure/src/stack_reverse.py
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+class Stack:
+    
+    """
+    A class representing a stack data structure.
+
+    Attributes:
+    stack (list): A list to store the elements of the stack.
+
+    Methods:
+    push(item): Adds an item to the top of the stack.
+    pop(): Removes and returns the top item from the stack.
+    is_empty(): Checks if the stack is empty.
+    """
+    def __init__(self):
+        """
+        Initializes an empty list to represent the stack.
+        """
+        self.stack = []
+
+    def push(self, item):
+        """
+        Adds an item to the top of the stack.
+
+        Parameters:
+        item (any): The item to be added to the stack.
+        """
+        self.stack.append(item)
+
+    def pop(self):
+        """
+        Removes and returns the top item from the stack.
+
+        Returns:
+        any: The top item from the stack, or None if the stack is empty.
+        """
+        return self.stack.pop() if not self.is_empty() else None
+
+    def is_empty(self):
+        """
+        Checks if the stack is empty.
+
+        Returns:
+        bool: True if the stack is empty, False otherwise.
+        """
+        return len(self.stack) == 0
+
+
+def reverse_string(s: str) -> str:
+    """
+    Reverses a given string using a stack.
+
+    Parameters:
+    s (str): The input string to be reversed.
+
+    Returns:
+    str: The reversed string.
+
+    Raises:
+    ValueError: If the input is not a string.
+    """
+    # Check if the input is a string, raise an error if not
+    if not isinstance(s, str):
+        raise ValueError("Input must be a string")
+
+    # Initialize a stack object to store characters
+    stack = Stack()
+
+    # Iterate over each character in the string
+    for char in s:
+        # Push each character onto the stack
+        stack.push(char)
+
+    # Initialize an empty string to store the reversed string
+    reversed_str = ""
+
+    # While the stack is not empty
+    while not stack.is_empty():
+        # Pop characters from the stack and append to the reversed string
+        reversed_str += stack.pop()
+
+    # Return the reversed string
+    return reversed_str
+
+
+print(reverse_string("Wellcome To My Data Structure Class Let's Have Fun Together!"))
diff --git a/Data_Structure/tests/__init__.py b/Data_Structure/tests/__init__.py
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diff --git a/Data_Structure/tests/test_linked_list_max.py b/Data_Structure/tests/test_linked_list_max.py
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+++ b/Data_Structure/tests/test_linked_list_max.py
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+from src.linked_list_max import LinkedList
+
+def test_linked_list_find_max():
+    """
+    This function tests the find_max method of a LinkedList class.
+
+    The LinkedList class is assumed to have the following methods:
+    - append(value): Adds a new node with the given value to the end of the list.
+    - find_max(): Returns the maximum value in the list. If the list is empty, raises a ValueError.
+
+    Raises:
+        AssertionError: If the find_max method does not return the expected maximum value 
+        or does not raise a ValueError for an empty list.
+    """
+
+    # Create and populate a LinkedList
+    ll = LinkedList()
+    ll.append(5)
+    ll.append(10)
+    ll.append(25)
+    ll.append(65)
+
+    # Print appended items
+    def print_list(linked_list):
+        items = []
+        current_node = linked_list.head
+        while current_node:
+            items.append(current_node.data)
+            current_node = current_node.next
+        return items
+    
+    print(f"LinkedList items: {print_list(ll)}")
+
+    # Find and print the maximum value
+    max_value = ll.find_max()
+    print(f"Maximum Value in LinkedList: {max_value}")  # Display maximum value
+    assert max_value == 65, f"Expected 65 but got {max_value}"
+
+    # Test find_max with an empty LinkedList
+    try:
+        empty_ll = LinkedList()
+        empty_ll.find_max()
+        assert False, "Did not raise ValueError for empty linked list"
+    except ValueError as e:
+        print(f"Error for empty LinkedList: {e}")  # Display error message
+
+if __name__ == "__main__":
+    test_linked_list_find_max()
+    print("All LinkedList find_max tests passed!")
diff --git a/Data_Structure/tests/test_queue_with_stacks.py b/Data_Structure/tests/test_queue_with_stacks.py
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index 0000000..aec2387
--- /dev/null
+++ b/Data_Structure/tests/test_queue_with_stacks.py
@@ -0,0 +1,94 @@
+from src.queue_with_stacks import QueueWithStacks
+
+class QueueWithStacks:
+    def __init__(self):
+        """
+        This class implements a queue using two stacks. The enqueue operation is performed on stack1,
+        and the dequeue operation is performed on stack2. When stack2 is empty, elements are transferred
+        from stack1 to stack2 to ensure the correct order of elements.
+        """
+        self.stack1 = []  # enqueue operations
+        self.stack2 = []  # dequeue operations
+
+    def enqueue(self, x: int):
+        """
+        Adds an element to the back of the queue.
+
+        Parameters:
+        x (int): The element to be added to the queue.
+        """
+        self.stack1.append(x)
+
+    def dequeue(self) -> int:
+        """
+        Removes and returns the front element of the queue.
+
+        Raises:
+        IndexError: If both stacks are empty, indicating that the queue is empty.
+
+        Returns:
+        int: The element at the front of the queue.
+        """
+        if not self.stack1 and not self.stack2:
+            raise IndexError("Dequeue from an empty queue")
+
+        if not self.stack2:
+            while self.stack1:
+                self.stack2.append(self.stack1.pop())
+
+        return self.stack2.pop()
+
+    def __str__(self):
+        """
+        Returns a string representation of the queue's current state.
+        """
+        if not self.stack2:
+            return str(self.stack1)
+        return str(self.stack2[::-1] + self.stack1)
+
+
+def test_queue_with_stacks():
+    """
+    This function tests the functionality of a Queue implemented using two Stacks.
+
+    The QueueWithStacks class has two methods:
+    - enqueue(value): Adds an element to the end of the queue.
+    - dequeue(): Removes and returns the element at the front of the queue.
+
+    Raises:
+        IndexError: If the dequeue method is called on an empty queue.
+    """
+    q = QueueWithStacks()
+    q.enqueue("Lesson1")
+    q.enqueue("Lesson2")
+
+    # Test first dequeue
+    first_out = q.dequeue()
+    print(f"Dequeued: {first_out} | Queue state: {q}")
+    assert first_out == "Lesson1"
+
+    # Test second and third dequeues
+    q.enqueue("Lesson3")
+    print(f"Queue after enqueueing 3-Lessons: {q}")
+
+    second_out = q.dequeue()
+    print(f"Dequeued: {second_out} | Queue state: {q}")
+    assert second_out == "Lesson2"
+
+    third_out = q.dequeue()
+    print(f"Dequeued: {third_out} | Queue state: {q}")
+    assert third_out == "Lesson3"
+
+    # Test dequeue on an empty queue
+    try:
+        empty_queue = QueueWithStacks()
+        empty_queue.dequeue()
+        assert False, "Did not raise IndexError for empty queue"
+    except IndexError:
+        print("IndexError raised as expected for empty queue")
+        assert True
+
+
+if __name__ == "__main__":
+    test_queue_with_stacks()
+    print("All QueueWithStacks tests passed!")
diff --git a/Data_Structure/tests/test_stack_reverse.py b/Data_Structure/tests/test_stack_reverse.py
new file mode 100644
index 0000000..528fb83
--- /dev/null
+++ b/Data_Structure/tests/test_stack_reverse.py
@@ -0,0 +1,37 @@
+from src.stack_reverse import reverse_string
+
+def test_reverse_string():
+    """
+    This function tests the reverse_string function from the src.stack_reverse module.
+
+    It tests the reverse_string function with various inputs and asserts that the
+    expected output matches the actual output. It also tests the function's behavior when
+    given a non-string input.
+    
+    Raises:
+    AssertionError: If any of the test cases fail.
+    ValueError: If the reverse_string function raises a ValueError for a non-string input.
+    """
+
+    # Test cases with assertions and print statements
+    s = "Wellcome To My Data Structure Class Let's Have Fun Together!"
+    reversed_s = reverse_string(s)
+    print(f"Original String: {s}, Reversed String: {reversed_s}")  # Display output
+    assert reversed_s == "!rehtegoT nuF evaH s'teL ssalC erutcurtS ataD yM oT emoclleW"
+
+    assert reverse_string("") == ""
+    assert reverse_string("a") == "a"
+    assert reverse_string("madam") == "madam"
+    assert reverse_string("wuodrose") == "esordouw"
+
+    # Test with non-string input
+    try:
+        reverse_string(12345)
+        assert False, "Did not raise ValueError for non-string input"
+    except ValueError:
+        print("ValueError raised as expected for non-string input")  # Display output
+        assert True
+
+if __name__ == "__main__":
+    test_reverse_string()
+    print("All reverse_string tests passed!")