Creating the landing page 

In this section, we're going to start off by creating the introduction section, which is our landing page. We will also be adding some of the Sass styling to our navigation, footer, and introduction section. Let's look at the code for our intro section:

<section class="intro">
 <div class="intro-body">
   <div class="container">
     <div class="row">
     <div class="col-lg-10 offset-lg-1 col-xl-8 offset-xl-2">
     <h1 class="brand-heading">Welcome</h1>
       <p class="intro-text">
       <strong>Digital Agency</strong> is here for all of your
       technology, advertising, SEO and marketing needs.</p>
     </div>
     </div>
   </div>
  </div>
</section>

So, we have created a section tag where our intro section code is going to be written. The section tag has a class called intro, which we will be using for styling purposes. For the same purpose, we have also added...