🧩 Design Patterns

**Design patterns** are proven solutions to common problems in object-oriented code. This course helps you move from “it works” to “clear and extensible” without memorizing all 23 patterns at once. You will study Singleton, Factory, Strategy, Observer, Decorator, and others through clear examples. Lessons show when a pattern helps and when it is overkill. After the course you will recognize patterns in existing code, apply them deliberately, and handle middle-level technical interviews better.