Topic 1 - CSS Intro
CSS stands for Cascading Style Sheets, this is how the elements on the HTML are displayed. CSS saves a lot of work as it can control the layout of multiple web pages at once. External style sheets are stored in the CSS file in your main root folder.
Topic 2 - CSS Syntax
The syntax of your code is important as if your syntax is off it can make your code look sloppy and maybe affect how your code operates. The selector element comes first as it is the style you want to change such as a h1. Then comes the declaration, this is what you are changing in that element, if you want to change the color in h1, in the declaration you'd type color: blue.
Topic 3 - CSS Selectors
CSS selectors are used to find the HTML elements you want to style. CSS selectors are divided into 5 categories, simple selectors select elements based on the name, id, or class. Combinator selectors selected elements based on the relationship between them. Pseudo-Class selectors selected elements based on a certain state. Pseudo-element selectors select and style certain parts of an element. Attribute selector selected elements based on attribute and attribute value.