OOP Principle

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1.Encapsulate what varies

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2.Code to an interface rather than to an implementation.

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3.Each class in your application should has one reason to change.

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4.Class are about behavior and functionality.

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5.OCP - Open Closed Principle
Classes should be open for extension and closed for modification.

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6.DRY - Don't Repeat Yourself
Avoid duplicate code by abstracting out things that things in a single location.

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7.SRP - Single Responsibility Principle
Every object in your system should have a single responsibility.

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8.LSP - Liskov Substitution Principle
Subtypes must by substitutable for their base types.