[Easy Task] Add comments to existing code for better understanding

### Description of the idea

Add clear, helpful comments to the code to improve readability for beginners. Focus on explaining logic, functions, loops, and conditionals.

✅ Tasks:

- Review the code

- Add meaningful comments (avoid obvious ones)

- Ensure code runs after changes

### Add several screenshots or links related to the idea (if applicable)

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### Add more details about the idea

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The issue names no files, tests, or entry points. Start by reviewing the repository to identify a focused area where comments would explain non-obvious logic, then confirm the code still runs after the comments are added. Done means the selected code has meaningful comments without obvious narration and remains runnable.

Written by the indexing model from the issue text.