Check out example codes for "bootstrap footer". It will help you in understanding the concepts better.

Code Example 1

<div class="navbar navbar-inverse navbar-fixed-bottom">
      <div class="container">
        <p class="navbar-text">© Random</p>
      </div>
    </div>

Code Example 2

<!-- Footer -->
<footer class="page-footer font-small cyan darken-3">

  <!-- Footer Elements -->
  <div class="container">

    <!-- Grid row-->
    <div class="row">

      <!-- Grid column -->
      <div class="col-md-12 py-5">
        <div class="mb-5 flex-center">

          <!-- Facebook -->
          <a class="fb-ic">
            <i class="fab fa-facebook-f fa-lg white-text mr-md-5 mr-3 fa-2x"> </i>
          </a>
          <!-- Twitter -->
          <a class="tw-ic">
            <i class="fab fa-twitter fa-lg white-text mr-md-5 mr-3 fa-2x"> </i>
          </a>
          <!-- Google +-->
          <a class="gplus-ic">
            <i class="fab fa-google-plus-g fa-lg white-text mr-md-5 mr-3 fa-2x"> </i>
          </a>
          <!--Linkedin -->
          <a class="li-ic">
            <i class="fab fa-linkedin-in fa-lg white-text mr-md-5 mr-3 fa-2x"> </i>
          </a>
          <!--Instagram-->
          <a class="ins-ic">
            <i class="fab fa-instagram fa-lg white-text mr-md-5 mr-3 fa-2x"> </i>
          </a>
          <!--Pinterest-->
          <a class="pin-ic">
            <i class="fab fa-pinterest fa-lg white-text fa-2x"> </i>
          </a>
        </div>
      </div>
      <!-- Grid column -->

    </div>
    <!-- Grid row-->

  </div>
  <!-- Footer Elements -->

  <!-- Copyright -->
  <div class="footer-copyright text-center py-3">© 2020 Copyright:
    <a href="https://mdbootstrap.com/"> MDBootstrap.com</a>
  </div>
  <!-- Copyright -->

</footer>
<!-- Footer -->

Code Example 3

Html
<body class="d-flex flex-column">
  <div id="page-content">
    <div class="container text-center">
      <div class="row justify-content-center">
        <div class="col-md-7">
          <h1 class="font-weight-light mt-4 text-white">Sticky Footer using Flexbox</h1>
          <p class="lead text-white-50">Use just two Bootstrap 4 utility classes and three custom CSS rules and you will have a flexbox enabled sticky footer for your website!</p>
        </div>
      </div>
    </div>
  </div>
  <footer id="sticky-footer" class="py-4 bg-dark text-white-50">
    <div class="container text-center">
      <small>Copyright &copy; Your Website</small>
    </div>
  </footer>
</body>

CSS
html,
body {
  height: 100%;
}

#page-content {
  flex: 1 0 auto;
}

#sticky-footer {
  flex-shrink: none;
}

/* Other Classes for Page Styling */

body {
  background: #007bff;
  background: linear-gradient(to right, #0062E6, #33AEFF);
}

EXTERNAL RESOURCES LOADED INTO THIS FIDDLE:
jquery.slim.js
bootstrap.min.css
bootstrap.bundle.min.js

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