1️⃣ SOLID Principles (For Object-Oriented Design)

• Single Responsibility Principle (SRP) – Each class should have one reason to change.
• Open/Closed Principle (OCP) – Open for extension, closed for modification.
• Liskov Substitution Principle (LSP) – Subtypes should be replaceable by their base types.
• Interface Segregation Principle (ISP) – No client should depend on methods it does not use.
• Dependency Inversion Principle (DIP) – Depend on abstractions, not concretions.

2️⃣ GRASP Patterns (Responsibility Assignment in OOP)

• Creator, Controller, Information Expert, Low Coupling, High Cohesion, etc.

3️⃣ Fundamental Principles

• DRY (Don’t Repeat Yourself) – Avoid code duplication.
• KISS (Keep It Simple, Stupid) – Simpler designs reduce complexity.
• YAGNI (You Ain’t Gonna Need It) – Don’t build for hypothetical future needs.
• Separation of Concerns (SoC) – Each module should handle a distinct concern.

4️⃣ High Cohesion & Low Coupling

• How to balance modularity and maintainability.

5️⃣ Law of Demeter (Principle of Least Knowledge)

• Minimizing dependencies between components.

6️⃣ Design for Scalability & Performance

• Trade-offs between efficiency, maintainability, and extensibility.

Would you like me to start with SOLID Principles first and go step by step, or do you prefer a comprehensive guide covering all topics in one blog?