What are the OO design basics?

Five Tips To Make Good Object-Oriented Code Better

Object-oriented programming has four basic concepts: encapsulation, abstraction, inheritance, and polymorphism .

Dependency Inversion Principle (SOLID) OOD Principles | SOLID. OOPs | Object Oriented Design.9 May 2019

Object-Oriented Analysis Objects that don’t need information can’t get to it . Objects that do need information can get to it (i.e., either they have it, or they have an instance variable that points to an object that has it.) Responsibility, control, and communication is distributed. One object doesn’t do everything.