SASS (Syntactically Awesome Style Sheets) is a scripting language known as a CSS preprocessor. CSS preprocessors are compiled into CSS and by doing so, extend the default capabilities of CSS.

Sass makes authoring stylesheets faster, easier, and more flexible. It’s a welcome helper in the world of web design, because anyone that’s created a website knows that CSS is hard.

In this course, you will learn how to use nesting, variables, mixins, partials, functions and more to write dynamic and reusable styles of code. You’ll also learn the various methods to structure your projects and bring organization to your stylesheets.

By the end of this course, you’ll have advanced knowledge of SASS. You’ll be able to migrate an existing CSS codebase, as well as set up an entire project (and build process) from scratch.

Sass for CSS: Advanced Frontend Development

When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

## Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

## Example
Take the following HTML:
```HTML
<nav class="navbar">
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

# Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

# Example
Take the following HTML:
```HTML
<nav class="navbar">
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

# Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

# Example
Take the following HTML:
```HTML
<nav>
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


In this lesson, we'll be introducing the SASS nesting syntax.

Starting with SASS

SASS Features

Structuring your SASS Projects

Setting up a SASS Build Process

Bonus: Setting up Media Queries with SASS Mixins

Appendix

Nesting

Definition #

Example #