SOLID

1. Single responsibility: a class should have 1 job
2. Open-closed principle: Open for extension but closed for modification
3. Liskov Substitution Principle: every subclass of a class should be able to substitute for its parent ^2c2ce6
4. Interface Segregation Principle: A client should never be fored to implement an interface that it doesn't use
5. Dependency Inversion Principle:

• High level module and low level modules should interact through abstraction rather than depending on each other.
• For example A talks to B interface rather than B directly