read CSS in Depth

1. Cascade, specificity, and inheritance
2. Working with relative units
3. Document flow and the box model
4. Flexbox
5. Grid layout
6. Positioning and stacking contexts
7. Responsive design
8. Cascade layers and nesting
9. Modular CSS and scope
10. Container queries
11. Color and contrast
12. Typography and spacing
13. Gradients, shadows, and blend modes
14. Masks, shapes, and clipping
15. Transitions
16. Transforms
17. Animations