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Adapter: Allows incompatible interfaces to work together. It acts as a bridge between two independent interfaces.Bridge: Decouples an abstraction from its implementation so that the two can vary independently.Composite: Composes objects into tree structures to represent part-whole hierarchies, allowing clients to treat individual objects and compositions uniformly.Decorator: Dynamically adds responsibilities to an object without altering its structure, providing a flexible alternative to subclassing for extending functionality.Facade: Provides a simplified interface to a large body of code, such as a class library or a complex subsystem.Flyweight: Reduces the cost of creating and manipulating a large number of similar objects by sharing as much data as possible.Proxy: Provides a surrogate or placeholder for another object to control access to it. Behavioral Design Patterns : It is arguably the best "first book"