HTML & CSS
Start with HTML and CSS Styling Essentials here — the core of what HTML & CSS Styling Core covers.
CSS (Cascading Style Sheets) controls color, typography, spacing, and layout.
Selectors target the elements you want to style.
When several rules target the same element, the CSS cascade decides which one applies.
Typography shapes the voice of your interface.
Color sets the mood and guides focus.
Every element on the page is a rectangular box.