Nested List

1. Background Skills
   1. Unix Commands
   2. Vim Test Editors
2. HTML
   1. Minimal Page
   2. Headings
   3. Elements
   4. Lists
      1. Unordered
      2. Ordered
      3. Definition
      4. Nested
   5. Links
      1. Absolute
      2. Relative
   6. Images
3. CSS
   1. Anatomy
   2. Basic Selectors
      1. Element
      2. Class
      3. ID
      4. Group
   3. The DOM
   4. Advanced Selectors
   5. Box Model
4. Programming
   1. Python
   2. JavaScript
5. Database
   1. Flat File
   2. Relational