In this section, you start learning about CSS (Cascading Style Sheet). You learned about CSS box model and Classes & Ids. And then we moved forward applying these classes and rule set to small business page.  You got also familiar with Google Chrome Developer Tool. So you learned below things in this section.

1. Google Chrome Developer Tool
   1. Learn about inspecting elements
2. What is CSS
   1. CSS is Cascading Style Sheet
   2. Use to apply style to a web page
   3.  Learn about CSS rut set Syntax
   4. Learn how to add external style sheet
   5. 3 ways to add CSS
      1. Inline style
      2.  Internal style sheet
      3. External style sheet
   6. Learn about link tag
3. CSS Box model  
   1. Content box
      1.  All content image, text, heading etc goes inside this content box
   2. Padding Box 
      1. Padding is used to generate space around content
   3. Border box  
      1. Border box is just border around content
   4. Margin Box 
      1. Margin generates space around the content but outside of boarded box
4.  CSS Classes & Ids
   1. Learn about CSS Class selector
   2. Learn about CSS ID selector

And then we start adding CSS to this small business page.