Google Notebooks are study tools used to facilitate learning about a specific topic. It is a reserach tool that limits results to what you've input in the tool. If AI or the internet is like going to the world's best librarian and asking for help finding resources about a topic, a Notebook is like handing a stack of information like books, articles, and interviews to the world's most capable research assistant and asking it to learn all of this informaiton and when I ask a question, only use this stack of information to answer me.