- Avoid using past tenses, for example instead created main.css use create main.css
- 320px — 480px: Mobile devices
- 481px — 768px: iPads, Tablets
- 769px — 1024px: Small screens, laptops
- 1025px — 1200px: Desktops, large screens
- 1201px and more — Extra large screens, TV
- Use variables, grouping and nexting to avoid code repitation
- Use white saces to seperate difference selectors.