SOLID

 SOLID stands for

• S -  Single Responsibility Principle
• O - Open Closed Principle
• L - Liskov Substitution Principle
• I -  Interface Segregation Principle
• D - Dependency Inversion Principle

Single Responsibility Principle

A class should have one and only one reason to change, meaning that a class should have only one job.

Open Closed Principle

Objects or entities should be open for extension but closed for modification.

Liskov Substitution Principle

Every subclass or derived class should be substitutable for their base or parent class.

Interface Segregation Principle

A client should never be forced to implement an interface that it doesn’t use, or clients shouldn’t be forced to depend on methods they do not use.

Dependency Inversion Principle

Entities must depend on abstractions, not on concretions. It states that the high-level module must not depend on the low-level module, but they should depend on abstractions.