Can you explain the main rule for dividing responsibilities among classes or modules in object-oriented programming?

The main rule for dividing responsibilities of classes or modules in object-oriented programming is the Single Responsibility Principle (SRP). It states that each class or module should have only one reason to change, meaning it should be responsible for a single specific task or functionality.

For example, a class responsible for working with a database should not handle displaying data in the user interface. This simplifies maintenance, testing, and extending the code.