Congratulations! You completed your first Sass StyleSheet and learned some powerful new concepts:

1. Nesting is the process of placing child selectors and properties in the scope of a parent selector. This allows a programmer to draw DOM relationships and avoid repetition.

2. Variables make it easy to update code and reference values by allowing you to assign an identifier to a value.

3. Sass Data Types include:

• Numbers
• Strings
• Booleans
• null
• Lists
• Maps

Nesting and variables are just two ways that Sass keeps stylesheets clean. In the next unit, you’ll learn about other Sass constructs that serve the same purpose.