In WordPress we can easily extend a parent theme by creating a child theme. How can we create a child plugin from parent plugin?

I search a lot and people suggested to use actions and hooks but what if a plugin doesn’t provide hooks and actions?

Actually I want to extend LearnDash plugin. I want to extend it’s functionality in my child plugin. So that if any updates comes in plugin, it shouldn’t conflict with our custom changes. But currently I have no idea how to extend it?