diff --git a/book.py b/book.py
new file mode 100644
index 0000000..86280c9
--- /dev/null
+++ b/book.py
@@ -0,0 +1,55 @@
+
+
+class Book():
+    def __init__(self,title,author,publication_year,is_borrowed,borrowed_by):
+        self.title = title
+        self.author = author
+        self.publication_year = publication_year
+        self.is_borrowed = is_borrowed
+        self.borrowed_by = borrowed_by
+
+    def show_info(self):
+       print("Title: ",self.title)
+       print("Author: ",self.author)
+       print("Publication_year: ",self.publication_year)
+       print("Is borrowed: ",self.is_borrowed)
+       print("Borrowed by: ",self.borrowed_by)
+         
+    def borrow(self,user):
+        if self.is_borrowed==True:
+            print("The book was already borrowed by: ",self.borrowed_by)
+        else:
+            print("The book is available.")
+            self.is_borrowed = True        # kitabı ödünç aldık
+            self.borrowed_by = user         # kullanıcıyı atadık
+            print(f"{self.title} has been borrowed by {user}.")   
+
+    def return_book(self,):
+        if self.is_borrowed == False:
+            print("The book is not borrowed")
+        else:
+            user = self.borrowed_by
+            self.is_borrowed = False
+            self.borrowed_by = None
+            print(f"The book returned by: {user}")
+
+    def to_dict(self):
+        return {
+            "title": self.title,
+            "author": self.author,
+            "publication_year": self.publication_year,
+            "is_borrowed": self.is_borrowed,
+            "borrowed_by": self.borrowed_by
+    }
+
+
+class Novel(Book):
+    def __init__(self,title,author,publication_year,is_borrowed,borrowed_by,genre):
+        Book.__init__(self,title,author,publication_year,is_borrowed,borrowed_by) 
+        self.genre = genre  
+
+class Magazine(Book):
+    def __init__(self,title,author,publication_year,is_borrowed,borrowed_by, issue):
+        Book.__init__(self,title,author,publication_year,is_borrowed,borrowed_by)
+        self.issue = issue
+
diff --git a/library.json b/library.json
new file mode 100644
index 0000000..6f54cb0
--- /dev/null
+++ b/library.json
@@ -0,0 +1,18 @@
+{
+    "books": [
+        {
+            "title": "Ada",
+            "author": "Ahmet",
+            "publication_year": 1900,
+            "is_borrowed": false,
+            "borrowed_by": null
+        }
+    ],
+    "users": [
+        {
+            "name": "nesli",
+            "password": "123",
+            "borrowed_books": []
+        }
+    ]
+}
\ No newline at end of file
diff --git a/library.py b/library.py
new file mode 100644
index 0000000..b390dc4
--- /dev/null
+++ b/library.py
@@ -0,0 +1,95 @@
+from book import Book
+from user import User
+import json
+import os
+
+class Library():
+    def __init__(self,name):
+        self.name = name
+        self.books = []
+        self.users = []
+
+    def add_book(self,book):
+        for b in self.books:
+            if b.title == book.title:
+                print(f"The book '{book.title}' already exixsts!")
+                return
+        self.books.append(book)
+        print(f"The book '{book.title}' added to the library")      
+
+    def add_user(self,user):
+        for u in self.users:
+            if u.name == user.name:
+                print("User already exists!")
+                return
+        self.users.append(user)
+        print(f"User '{user.name}' added to the library!")    
+
+    def show_all_books(self):
+        for book in self.books:
+            print("-" * 40)
+            print("Title:",book.title)
+            print("Author:",book.author)
+            print("Available:", not book.is_borrowed)
+            print("Borrowed by:",book.borrowed_by)
+            print("-" * 40)
+
+    def login(self,name,password):
+        for user in self.users:
+            if user.name == name and user.password == password:
+                return user
+            
+        print("user not found or password incorrect")
+        return None
+    
+    def borrow_book(self,user,title):
+        title = title.strip()
+        for book in self.books:
+            if book.title == title:
+                user.borrow_book(book)
+                return 
+        print("Book not found")
+
+    def return_book(self,user,title):
+        title = title.strip()
+        for book in self.books:
+            if book.title == title:
+                user.return_book(book)
+                return
+        print("Book not found.")         
+
+    def save(self,file):     #save to json
+        book_list =[book.to_dict() for book in self.books]
+        user_list =[user.to_dict() for user in self.users]
+        data ={
+            "books":book_list,
+            "users": user_list
+        }
+        with open(file, "w", encoding="utf-8") as f:
+            json.dump(data,f,ensure_ascii=False, indent=4)
+
+    def load(self,file):      #load from json
+        if not os.path.exists(file):
+            return
+        with open(file, "r", encoding="utf-8") as f:
+            data = json.load(f)
+
+        self.books = []
+        for book_data in data["books"]:
+            book = Book(**book_data)
+            self.books.append(book)
+
+        self.users = []
+        for user_data in data["users"]:
+             # Önce borrowed_books başlıklarını boş liste yap
+            borrowed_books_titles = user_data.pop("borrowed_books")
+            user = User(**user_data, borrowed_books=[])  # boş liste ile yarat
+            self.users.append(user)
+
+    # Sonra borrowed_books listesini gerçek Book objeleri ile doldur
+            for title in borrowed_books_titles:
+                book = next((b for b in self.books if b.title == title), None)
+                if book:
+                    user.borrowed_books.append(book)
+                    book.is_borrowed = True
+                    book.borrowed_by = user.name
\ No newline at end of file
diff --git a/login_page.py b/login_page.py
new file mode 100644
index 0000000..d1ef1e0
--- /dev/null
+++ b/login_page.py
@@ -0,0 +1,100 @@
+from book import Book, Novel, Magazine
+from user import User
+from library import Library
+
+data_file = "library.json"
+
+library = Library("My Library")
+
+library.load(data_file)
+
+library.add_book(Book("Ada", "Ahmet", 1900, False, None))
+
+current_user = None
+
+
+while True:
+
+    print("-" * 60)
+    print()
+    print(" 1- LOGIN             ")
+    print(" 2- CREATE ACOUNT     ")
+    print(" 3- EXIT.             ")
+    print()
+    print("-" * 60)
+
+    choice = input("Enter your choice please: ")
+    if choice =="1":
+        name = input("Enter a name: ")
+        password = input("Enter a password: ")
+        user = library.login(name,password)
+
+        if user:
+            current_user = user
+            print(f"\nWelcome back, {current_user.name}!")
+
+            while True:
+                print("-" * 60)
+                print()
+                print(" 1- LIST ALL BOOKS ")
+                print(" 2- BORROW A BOOK  ")
+                print(" 3- RETURN A BOOK  ")
+                print(" 4- SHOW MY BORROWED BOOKS")
+                print(" 5- SAVE AND EXIT")
+                print()
+                print("-" * 60)
+                
+                option = input("Enter your choice please: ")
+
+                if option == "1":
+                    library.show_all_books()
+
+                elif option == "2":  
+                    title = input("Enter book title: ")
+                    library.borrow_book(current_user, title)  
+
+                elif option == "3":
+                    title = input("Enter book title: ")
+                    library.return_book(current_user, title)
+
+                elif option == "4":
+                    current_user.list_borrowed_books() 
+
+                elif option == "5":
+                    current_user = None
+                    print("Logged out. Saving data...") 
+                    library.save(data_file)  
+                    break
+
+                else:
+                    print("Invalid option.")    
+        
+        else:
+            print("Login failed.")
+
+    elif choice == "2":
+        name =  input("Enter a name: ")
+        password = input("Enter a password: ")
+        new_user = User(name,password,[])
+        library.add_user(new_user)
+        print("Account created!")
+             
+    elif choice == "3":
+        library.save(data_file)
+        print("Data saved.")
+        break
+
+    else:
+        print("Invalid choice!")
+
+
+
+
+# def borrow_by_title(user, all_books, title):
+#     book_to_borrow = next((b for b in all_books if b.title == title), None)
+#     if book_to_borrow:
+#         user.borrow_book(book_to_borrow)
+#     else:
+#         print(f"Book '{title}' not found!")
+
+    
diff --git a/user.py b/user.py
new file mode 100644
index 0000000..d87a44b
--- /dev/null
+++ b/user.py
@@ -0,0 +1,56 @@
+from book import Book
+import json
+
+
+
+class User():
+    def __init__(self,name,password,borrowed_books):
+        self.name = name
+        self.password = password
+        self.borrowed_books = borrowed_books
+
+    def borrow_book(self,book):
+        if book.is_borrowed == True:
+            print("The book was already borrowed.")
+        else:
+            book.borrow(self.name)
+            self.borrowed_books.append(book)
+
+    def return_book(self,book):
+        if book not in self.borrowed_books:
+            print("You did not borrow this book.")
+        else:
+            book.return_book()
+            self.borrowed_books.remove(book)
+            
+
+    def list_borrowed_books(self):
+        if not self.borrowed_books:
+            print("You have no borrowed books.")
+        else:
+            for book in self.borrowed_books:
+                print("title:", book.title, "|Author:" ,book.author )
+
+
+    def to_dict(self):
+        return {
+        "name": self.name,
+        "password": self.password,
+        "borrowed_books": [book.title for book in self.borrowed_books]
+    }
+    
+
+# # Test için kullanıcı
+# test_user = User("Ayşe", "123",[])
+
+# # Örnek kitaplar
+# all_books = [
+#     Book("Ada", "Ahmet", 1900, False, None),
+#     Book("Deniz", "Mehmet", 1920, False, None)
+# ]
+
+# # Ödünç alma testi
+# #borrow_by_title(test_user, all_books, "Ada")  # Tek satırla ödünç al
+
+# # Kullanıcının ödünç aldığı kitapları listele
+# #test_user.list_borrowed_books()