Each branch represent example of using pattern. Some patterns have more than one example (due to different learning sources).

Strategy: Headfirst

Observer: Headfirst, refactoring.guru - real world

Decorator: Headfirst, refactoring.guru - concept

Simple Factory: designpatternsphp.readthedocs.io

Abstract Factory: refactoring.guru - concept

Factory Method: refactoring.guru - concept

Singleton: refactoring.guru, designpatternsphp.readthedocs.io

Command: Headfirst, refactoring.guru - real world

Facade: designpatternsphp.readthedocs.io