Design patterns are solutions to recurring problems, guidelines on how to tackle certain problems. They are not classes, packages or libraries that you can plug into your application and wait for the magic to happen. These are, rather, guidelines on how to tackle certain problems in certain situations.
All examples get from:
Design Patterns For Humans
Design Patterns in TypeScript
DesignPatternsPHP
Derek Banas - Design Patterns Video Tutorial
Christopher Okhravi - Design Patterns in Object Oriented Programming
https://www.youtube.com/playlist?list=PLrhzvIcii6GNjpARdnO4ueTUAVR9eMBpc