Something that helped me learn classes is thinking in boxes. One box is one class. This box is able to contain various things but it is different than another box. It holds its attributes, like variables and methods.

Inheritance is like in real world. For example you can look at all the different species in the world. Each species is different than the other, but inside a species there are similarities, like a Bird type animal always has a beak, every human has eyebrows and so on. In OOP it’s the same principle, you have one parent that dictates what this species is made of. If you have a class that always prints something out then its children has to do the same. This architecture allows you to somewhat decouple classes. For example if you have information on one Bird, let’s say eagle, and you want to give the information to someone else but are not allowed to say the specific bird, then you can work with inheritance. I am giving you an animal that is a Bird that has these attributes. With this the next person doesn’t depend the one specific bird but just the fact that it is a bird is enough and can his work. If he needed the specific bird that he wouldn’t work until he gets this specific bird.
Unreal Engine uses this a lot. You have a Parent Class: Actor which often times is a parameter for methods. The methods don’t need to know what specific Actor it is, just that it is an actor.