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