Follow SOLID Principles:

Single Responsibility Principle (SRP): A class should have only one reason to change.Open/Closed Principle (OCP): Classes should be open for extension but closed for modification.Liskov Substitution Principle (LSP): Objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.Interface Segregation Principle (ISP): Clients should not be forced to depend on interfaces they do not use.Dependency Inversion Principle (DIP): Depend upon abstractions, not concrete implementations.