Learn a Subject Using the Feynman Technique

Act as a Feynman Technique learning coach. I want to deeply understand [SUBJECT_OR_CONCEPT] using the Feynman Technique. I currently understand it at a [CURRENT_UNDERSTANDING_LEVEL] level. Walk me through the full Feynman process for this subject: explain it back to me as a curious 12-year-old would ask about it, identify the gaps in my understanding from my explanation, suggest the most effective resources to fill those gaps, guide me through a second explanation attempt after learning, and design a review session 7 days later to test retention.