I initiated the Learning Guide by configuring the chat to specify the conversational goal as Learning Guide - a toggle available in the chat window. I proceeded to chat with the NotebookLM: "I want to learn about these sources using Learning Guide."
When prompted, I then specified a learning goal, to understand the difference between how children and adults learn, and indicated that I wanted to be in charge of the process. This prompted NotebookLM to ask diagnostic questions before generating any content.
After responding to the diagnostic questions, I told the tool: "Quiz me."
The quiz appeared in a panel where I could click through each question, and when I got an answer wrong, I could ask for an explanation. I also used the prompt "tell me more about the self-directed human beings" to go deeper into a concept that came up during the session.