An email address created in childhood, often amusing or quirky, can cause embarrassment not only for yourself but also for the recipient. The foundation of effective business communication and career management begins with possessing an email address that is both memorable and conveys professionalism.

During my university days, object-oriented programming felt limited to polymorphism and inheritance. Developing in the industry, I profoundly realized that OOP is not merely an academic concept but a practical discipline. One might wonder why the first and second principles of OOP are discussed before delving into design patterns. Design patterns are 'the culmination of deliberation on what constitutes better code within the object-oriented paradigm.' To truly grasp the significance of various design patterns, it is essential to first understand the fundamental principles of object-oriented programming.