1. The Proxy Pattern is used when you need to provide an object that controls access to another object. 2. The Command Pattern is used when you need to execute a command that will affect the behavior...

1. The Proxy Pattern is used when you need to provide an object that controls access to another object.

2. The Command Pattern is used when you need to execute a command that will affect the behavior of an object.

3. The Publisher/Subscriber Pattern is useful when you need to provide information about an object to a group of other objects.

4. The DI Pattern is useful if you want to implement the Dependency Inversion principle.