diff --git a/introduction-to-typescript b/introduction-to-typescript
new file mode 160000
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--- /dev/null
+++ b/introduction-to-typescript
@@ -0,0 +1 @@
+Subproject commit f8d3a14c4b4e8ec068697935a14063630d2679f5
diff --git a/sprint-5-prep/classes-and-objects-and-methods.py b/sprint-5-prep/classes-and-objects-and-methods.py
new file mode 100644
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+++ b/sprint-5-prep/classes-and-objects-and-methods.py
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+from datetime import date
+
+class Person:
+    def __init__(self, name: str, dOB: date, preferred_operating_system: str):
+        self.name = name
+        self.dOB = dOB
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self) -> bool:
+        today = date.today()
+        eighteen_years_ago = date(today.year - 18, today.month, today.day)
+        return self.dOB <= eighteen_years_ago
+
+imran = Person("Imran", date(1992, 7, 21), "Ubuntu")
+print(imran.name)
+
+print(imran.is_adult())
+
diff --git a/sprint-5-prep/dataclasses-chapter.py b/sprint-5-prep/dataclasses-chapter.py
new file mode 100644
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+++ b/sprint-5-prep/dataclasses-chapter.py
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+from dataclasses import dataclass
+from datetime import date
+
+@dataclass (frozen=True)
+class Person:
+    name: str
+    DOB: date
+    preferred_operating_system: str
+
+    def is_adult(self) -> bool:
+        today = date.today()
+        eighteen_years_ago = date(today.year - 18, today.month, today.day)
+        return self.DOB <= eighteen_years_ago
+
+imran = Person("Imran", date(1992, 7, 21), "Ubuntu")
+print(imran.name)
+
+imran2 = Person("Imran", date(1992, 7, 21), "Ubuntu")
+print(imran == imran2) 
+
+eliza = Person("Eliza", date(1982, 4, 5), "Arch Linux")
+print(eliza.name)
+
+
+print(imran.is_adult())
+print(eliza.is_adult())
diff --git a/sprint-5-prep/enums-chapter.py b/sprint-5-prep/enums-chapter.py
new file mode 100644
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--- /dev/null
+++ b/sprint-5-prep/enums-chapter.py
@@ -0,0 +1,81 @@
+import sys
+from sys import stderr
+from dataclasses import dataclass
+from enum import Enum
+from typing import List
+
+class OperatingSystem(Enum):
+    MACOS = "macos"
+    ARCH = "arch linux"
+    UBUNTU = "ubuntu"
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: OperatingSystem
+
+available_laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system=OperatingSystem.MACOS),
+    Laptop(id=5, manufacturer="HP", model="Spectre", screen_size_in_inches=13, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=6, manufacturer="Lenovo", model="ThinkPad", screen_size_in_inches=14, operating_system=OperatingSystem.ARCH),
+    Laptop(id=7, manufacturer="Apple", model="MacBook Pro", screen_size_in_inches=16, operating_system=OperatingSystem.MACOS),
+    Laptop(id=8, manufacturer="Dell", model="Inspiron", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=9, manufacturer="Asus", model="ZenBook", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+]
+
+
+
+def error_exit(message: str, code: int =1) -> None:
+    print(f"Error: {message}", file=stderr)
+    sys.exit(code)
+
+def number_of_laptops_per_os() -> dict[OperatingSystem, int]:
+    os_count: dict[OperatingSystem, int] = {
+        OperatingSystem.MACOS: 0,
+        OperatingSystem.ARCH: 0,
+        OperatingSystem.UBUNTU: 0,
+    }
+    for laptop in available_laptops:
+        os_count[laptop.operating_system] += 1
+    return os_count
+
+def main() -> None:
+    name: str = input("Enter your name: ").strip()
+    if not name:
+        error_exit("Name cannot be empty.")
+    
+    try:
+        age: int = int(input("Enter your age: ").strip())
+        if age <= 0:
+            error_exit("Age must be a positive integer.")
+    except ValueError:
+        error_exit("Invalid age. Please enter a positive integer.")
+
+    try:
+        preferred_operating_system: OperatingSystem = OperatingSystem(input("Enter your preferred operating system (macOS, Arch Linux, Ubuntu): ").strip().lower())
+    except ValueError:
+        error_exit("Invalid operating system. Choose from macOS, Arch Linux, Ubuntu.") 
+    
+    person = Person(name=name, age=age, preferred_operating_system=preferred_operating_system)
+ 
+    os_count = number_of_laptops_per_os()
+    print(f"Hi {person.name}, there are {os_count[preferred_operating_system]} laptops available with {preferred_operating_system.value}.")
+    max_os, max_count = max(os_count.items(), key=lambda item: item[1])
+    print(f"The operating system with the most laptops is {max_os.value} with {max_count} laptops.")
+    print ("person:", person)
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/sprint-5-prep/generics-chapter.py b/sprint-5-prep/generics-chapter.py
new file mode 100644
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--- /dev/null
+++ b/sprint-5-prep/generics-chapter.py
@@ -0,0 +1,19 @@
+from dataclasses import dataclass
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    children: list["Person"]
+
+fatma = Person(name="Fatma", children=[], age=5)
+aisha = Person(name="Aisha", children=[], age=3)
+
+imran = Person(name="Imran", children=[fatma, aisha], age=35)
+
+def print_family_tree(person: Person) -> None:
+    print(person.name)
+    for child in person.children:
+        print(f"- {child.name} ({child.age})")
+
+print_family_tree(imran)
diff --git a/sprint-5-prep/how-we-use-types.md b/sprint-5-prep/how-we-use-types.md
new file mode 100644
index 00000000..e9938e15
--- /dev/null
+++ b/sprint-5-prep/how-we-use-types.md
@@ -0,0 +1,28 @@
+```python
+def half(value):
+    return value / 2 
+
+def double(value):
+    return value * 2 
+
+def second(value):
+    return value[1]
+
+print(double(22))
+print(double("hello"))
+print(double("22"))
+```
+# Exercise 1:
+
+Prediction:
+double("22") will raise a typeError because "22" is a string.
+
+Actual Result:
+double ("22") actually returned "2222" so it actually resulted in a string repetition "2222"
+this shows that the '*2' sign on strings will repeat them
+
+# Exercise 2:
+
+the bug on the code is the naming of the function. you can't call a function double() but then
+the math is [value *3]. so we should either rename it triple() or change the method to [value *2]
+depending on the context and what we are trying to achieve.
\ No newline at end of file
diff --git a/sprint-5-prep/inheritance-chapter.py b/sprint-5-prep/inheritance-chapter.py
new file mode 100644
index 00000000..e11b5410
--- /dev/null
+++ b/sprint-5-prep/inheritance-chapter.py
@@ -0,0 +1,37 @@
+class Parent:
+    def __init__(self, first_name: str, last_name: str):
+        self.first_name = first_name
+        self.last_name = last_name
+
+    def get_name(self) -> str:
+        return f"{self.first_name} {self.last_name}"
+
+
+class Child(Parent):
+    def __init__(self, first_name: str, last_name: str):
+        super().__init__(first_name, last_name)
+        self.previous_last_names = []
+
+    def change_last_name(self, last_name) -> None:
+        self.previous_last_names.append(self.last_name)
+        self.last_name = last_name
+
+    def get_full_name(self) -> str:
+        suffix = ""
+        if len(self.previous_last_names) > 0:
+            suffix = f" (née {self.previous_last_names[0]})"
+        return f"{self.first_name} {self.last_name}{suffix}"
+
+person1 = Child("Elizaveta", "Alekseeva")
+print(person1.get_name())
+print(person1.get_full_name())
+person1.change_last_name("Tyurina")
+print(person1.get_name())
+print(person1.get_full_name())
+
+person2 = Parent("Elizaveta", "Alekseeva")
+print(person2.get_name())
+# print(person2.get_full_name())
+# person2.change_last_name("Tyurina")
+print(person2.get_name())
+# print(person2.get_full_name())
\ No newline at end of file
diff --git a/sprint-5-prep/type-checking-with-mypy.py b/sprint-5-prep/type-checking-with-mypy.py
new file mode 100644
index 00000000..274a5c0d
--- /dev/null
+++ b/sprint-5-prep/type-checking-with-mypy.py
@@ -0,0 +1,30 @@
+def open_account(balances: dict[str, int], name: str, amount: float) -> None:
+    balances[name] = int(amount*100)
+
+def sum_balances(accounts: dict[str, int]) -> int:
+    total = 0
+    for name, pence in accounts.items():
+        print(f"{name} had balance {pence}p")
+        total += pence
+    return total
+
+def format_pence_as_string(total_pence: int) -> str:
+    if total_pence < 100:
+        return f"{total_pence}p"
+    pounds = int(total_pence / 100)
+    pence = total_pence % 100
+    return f"£{pounds}.{pence:02d}"
+
+balances = {
+    "Sima": 700,
+    "Linn": 545,
+    "Georg": 831,
+}
+
+open_account(balances, "Tobi", 9.13)
+open_account(balances, "Olya", 7.13)
+
+total_pence = sum_balances(balances)
+total_string = format_pence_as_string(total_pence)
+
+print(f"The bank accounts total {total_string}")
diff --git a/sprint-5-prep/type-guided-refactoring.py b/sprint-5-prep/type-guided-refactoring.py
new file mode 100644
index 00000000..2eb2d935
--- /dev/null
+++ b/sprint-5-prep/type-guided-refactoring.py
@@ -0,0 +1,43 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_systems: List[str]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: str
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+        for os in person.preferred_operating_systems:
+            if laptop.operating_system == os:
+                possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu", "Arch Linux"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["Arch Linux"]),
+]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system="Arch Linux"),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="Ubuntu"),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="ubuntu"),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system="macOS"),
+]
+
+for person in people:
+    possible_laptops = find_possible_laptops(laptops, person)
+    print(f"Possible laptops for {person.name}: {possible_laptops}")