What are the principles of SOLID in programming?

SOLID is an acronym representing a set of five core principles of object-oriented design aimed at creating more understandable, flexible, and maintainable code.

Principles:

1. Single Responsibility Principle: A module or class should have only one reason to change, meaning it should have only one responsibility.

2. Open/Closed Principle: Software entities (classes, modules, functions) should be open for extension but closed for modification.

3. Liskov Substitution Principle: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of the program. If S is a subtype of T, then objects of type T in the program can be replaced with objects of type S without violating the program's properties.

4. Interface Segregation Principle: Many specific interfaces are better than one general-purpose interface. Clients should not depend on interfaces they do not use.

5. Dependency Inversion Principle: High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details. Details should depend on abstractions.

Using SOLID principles promotes the development of systems that are easy to change, understand, and test. In Golang, SOLID principles are applicable, although language features (such as the lack of classical inheritance) require a different approach to their implementation, often through composition and interfaces.