Application Design Patterns is an important aspect of software development that involves creating reusable models or templates for solving common problems that arise during application development. In the Go programming language, there are various design patterns that can be used to improve the efficiency, maintainability, and scalability of applications.

One of the most popular design patterns in Go is the Singleton pattern, which ensures that a class has only one instance and provides a global point of access to it. This pattern is useful in controlling access to shared resources, such as database connections or loggers, among other things.

Another pattern that is useful in Go is the Builder pattern. This pattern is used to construct complex objects using simpler objects or building blocks. It is useful in decoupling the construction of complex objects from their representation, making it easier to change the representation of the object without affecting its construction.

The Decorator pattern is also useful in Go, especially when dealing with objects that have multiple responsibilities. This pattern involves attaching additional responsibilities to an object dynamically, without changing the object's code. This is useful when you want to add features to an object without changing its existing functionality.

Overall, learning about Application Design Patterns in Go will give you the ability to create more efficient, scalable, and maintainable code. It provides a way to solve common problems in software development and improve the quality of your applications.