Reference

HTML

Emmet

[Emmet.io: Emmet Cheat Sheet](https://docs.emmet.io/cheat-sheet/)

Semantic HTML

[W3Schools: HTML Semantic Elements](https://www.w3schools.com/html/html5_semantic_elements.asp)

SEO Best Practices (2021)

[SEONeurons: HTML5 Page Structure best practice for SEO of website](https://seoneurons.com/seo/html5-page-structure-best-practices/)

CSS

Selectors

[FrontEnd30: CSS Selector Cheatsheet](https://frontend30.com/css-selectors-cheatsheet/)

Flex

[CSS-TRICKS: A Complete Guide to Flexbox](https://css-tricks.com/snippets/css/a-guide-to-flexbox/)

Reset

[Andy Bell's Modern CSS Reset](https://piccalil.li/blog/a-modern-css-reset/)

Accessibility

Color

[Who can use](https://whocanuse.com/)