Understand different times, like Grapes of Wrath. Read about them. Learn social values of different times 50's, 60's, 70's, 80's and 90's to make choices . Let the character have a private existence. Young actors just open the character because they feel they need everybody.
Character can be out of control, but never the actor .
Take on all the troubles of the character . The character must suffer . Acting is not imitating the character , it's being the character . All scenes, where there is a scene of revelation of character . Seven veils , building up revelation.