For me, nothing will replace the original GoF book: "Design Patterns: Elements of Reusable Object-Oriented Software" It's still worth reading. But I also recomm

For me, nothing will replace the original GoF book: "Design Patterns: Elements of Reusable Object-Oriented Software" It's still worth reading. But I also recommend "Object-Oriented Analysis and Design with Applications" by Grady Booch. It's not strictly design patterns, but it's a classic that explores a lot of the fundamental concepts you'll need for DP.