Topic 1: The language that we use to style the web is known as CSS.

The term CSS represents Cascading Style Sheets. It describes how the HTML elements that we have selected appear on the screen. It has been known to save a lot of work, since it has the ability to control the layout of multiple websites all at the same time. CSS files are stored in external style sheets.

Topic 2: A CSS rule consists of two things; a selector and a declaration block.

Using the selector we point to the HTML style that we want. Inside of the declaration block contains one or more declarations that are separated by semicolons. Each of these declaration boxes contains a CSS property name and a value assigned to it, separated by a colon. If there are multiple CSS declarations than they are to be separated by a semi-colon. If there are multiple declaration blocks than they are surrounded by curly braces.

Topic 3: CSS are typically used to select or find the HTML elements that you would like to style.

Simple selectors are used when you would like to select elements that are based on id, name, and class. Using combinator selectors, we choose elements based on the specific relationship that they have between them. Pseudo-class selectors are traditionally used to select elements based on a certain state. Pseudo-element selectors select and style a specific part of an element. Attribute selectors are those that select elements based on an attribute or an attribute value.