The SOLID principles are a set of golden rules that aim to improve the design and maintainability of software.

Following the SOLID principles when designing and building software, including:

- Improved maintainability: You can create code that is easier to maintain and modify over time because the SOLID principles encourage the creation of modular, flexible code that is less prone to errors and more resistant to changes in requirements.

- Reduced complexity: The SOLID principles help to reduce the complexity of software by promoting the use of abstraction and encapsulation, which can make it easier to understand and work with the code.

- Enhanced flexibility: These principles encourage the creation of flexible code that is open to extension but closed to modification, which encourages flexibility without breaking existing functionality.

- Increased scalability: The SOLID principles can help to make software more scalable, as they encourage the use of abstractions and decoupled dependencies, which can help to prevent the codebase from becoming overly complex and difficult to manage.

The 5 principles of SOLID are:

• S: Single-responsibility principle
• O: Open-closed principle
• L: Liskov substitution principle
• I: Interface segregation principle
• D: Dependency inversion principle
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Resources: educative https://www.educative.io/blog/solid-principles-oop-c-sharp