- http://learn.shayhowe.com/html-css/
- http://learn.shayhowe.com/advanced-html-css/
- https://cssguidelin.es/
- http://youmightnotneedjquery.com/
- https://csswizardry.com/
- https://css-tricks.com/
- https://csswizardry.com/2014/08/advice-to-budding-front-end-developers/
- https://github.com/grab/front-end-guide
- add flex
- write some intro