Once you've got an intuitive picture of how something works, you will find that the details just fall into place. But often that intuitive picture can't just be

Once you've got an intuitive picture of how something works, you will find that the details just fall into place. But often that intuitive picture can't just be gifted to you, despite the best efforts of our best teachers to concoct the perfect metaphors. It takes time. You have to fiddle around with the concepts in your head, sometimes for years, before they really sink in. You might have to repeat them several times, or approach them from several angles, or encounter them in unusual surroundings, or find the one book that finally explains the subject in a way that clicks. Once you really understand something, trying to remember what it was like before you understood it is like trying to forget how to read.