Product Manager Business Logic Visualization Guide

I am a non-technical product manager, and I want to deeply organize the business through Mermaid charts. Please help me analyze what points in here are worth digging into. Help me write several logically detailed explanation documents and place them in docs/explain/*.md. The documents need to extensively use Mermaid syntax to visualize these logics, the more detailed the better, the more detailed the better, the more detailed the better, so that even if I don't understand technology, I can see the direction of the business logic at a glance. Thank you for your hard work!