• 4**-1: Basic Introduction of OOP**
• 4**-2: How to Create Class, Object, Parameter Properties**
• 4**-3: Inheritance**
• 4**-4: Type Guards / Type Narrowing**
• 4**-5: Access Modifiers: Public, Private, Protected**
• 4**-6: Getters and Setters in TypeScript**
• 4**-7: Polymorphism**
• 4**-8: Abstraction**
• 4**-9: Encapsulation**