What is the difference between public, protected and private inheritance in C++?

Hello, colleagues! I started learning C++ and encountered confusion with inheritance. I understand there are three access specifiers: public, protected and private. But when I try to apply them to inheritance, I get lost. For example, I have a base class: ```cpp class Base { public: int pub = 1; protected: int prot = 2; private: int priv = 3; }; ``` I want to create a Derived class that inherits from Base. I tried writing `class Derived : public Base`, `class Derived : protected Base` and `class Derived : private Base`. In each case the behavior is different, but I cannot understand what exactly the difference is. Why, for example, with private inheritance I cannot access pub from outside? And what is "accessibility" of the derived class's members? I feel like I'm missing some fundamental concept.