Tutorials! What would you like to see?

I need tutorials about general things, some common like game itself - like save-load, “new game” and “exit” processes, menus, how they must be done and THEN going to details like 3d system in objects and blueprints, how they are realised FROM GENERAL. But you made videos vice versa - from details to general, you describe editing interface in already done games samples but I don’t know what do they mean.