Write a multi-section explanation of {{topic}} for {{target_audience}} to help them achieve {{goal}}. Use a {{tone}} tone. Start each concept with a concrete example before defining it formally. Keep total length under 1700 words. End each section with a one-sentence key takeaway. Include: Simple Explanation (ELI5), Standard Explanation, Deep Dive, Visual/Mental Model, Practice and Application (with 3 questions), Memory Aids, and Summary. Paste any relevant background information after these instructions before running.