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学什么技能 ： SkillKit → 从哪里学 NoteFrom → Notes → 怎么用（抽象概念）
（大分类 英语 ，Java，） → ( Project 开言英语) → A01U01 → 细分标签往上分类(什么话题 / 什么感情色彩， 多种成组的分类方法，自己可按 tag 区分)
Group→ SkillKit → NoteFrom → Notes ← NotesFor (因为 From 和 For不是 完全的多对一关系，所以分别Db）
Notes 标题都扁平化，例如 From 开言英语， NotesTitle as A01-Unit1.1 - xxxxx
🌍 How This Works in Notion
| Knowledge Graph (NoSQL-style, Dynamic) | Category System (SQL-style, Stable) |
|---|---|
| “Operating System” → “File System” → “FD” | “CS Basics” → “CS” → “STEM” |
| Self-referencing Parent Node for deep growth ✅ | Structured categories for easy retrieval ✅ |
| Flexible, new layers can be added anytime | Stable, easy filtering by topic |
✔ One dynamic NoSQL-style “Knowledge Graph” → Allows notes to expand naturally.
✔ One stable SQL-style “Category System” → Provides structured, reliable entry points.
✔ Both are linked together → So you can navigate knowledge efficiently.
• SQL-style (Relational Database)
• ✅ Pros: Clear structure, easy filtering, predefined relationships.
• ❌ Cons: Rigid schema, difficult to modify hierarchy dynamically.
• NoSQL-style (Self-referencing Nodes)
• ✅ Pros: Flexible, dynamic growth, easily adds new layers.
• ❌ Cons: Hard to find entry points, no structured organization.