# Lesson Unit Template

Create an independent folder or document for each unit. For code courses, use a structure such as `NN-topic/README.md`, `exercise.<ext>`, and `solution.<ext>`.

```markdown
# Unit Title

## Goal

## Prerequisites

## Problem To Solve

## Core Concepts And API / Method Reference

## Minimal Experiment

## Step-by-Step Implementation

## Practice

## Run And Verification

## Common Misconceptions

## My Understanding

## Review And Next Step
```

Explain why a decision was made, not only the final answer. For code changes, record the starting point, key changes, actual commands, and results.