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About the <head>

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <html>

<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<script defer src="https://use.fontawesome.com/releases/v5.0.8/js/all.js" integrity="sha384-SlE991lGASHoBfWbelyBPLsUlwY1GwNDJo3jSJO04KZ33K2bwfV9YBauFfnzvynJ" crossorigin="anonymous"></script>
 
  
  <title>Martín Comito - Home</title>
</head>

<body>
  <!--  NAVBAR  -->
    <nav class="navbar navbar-expand-lg sticky-top navbar-dark bg-dark">
      <a class="navbar-brand" href="#">Martín Comito</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#aboutme">About me</a>
          </li>

          <li class="nav-item">
            <a class="nav-link" href="#portfolio">Portfolio</a>
          </li>
          
          <li class="nav-item">
            <a class="nav-link" href="#contact">Contact me</a>
          </li>          
        </ul>
      </div>
    </nav>
  <!--  NAVBAR  -->
  
  <header>
    
	</header>
	
	<section>
	  <div class="container-fluid seccion" id="aboutme">
      <div class="row">
        <div class="col-md aboutme-div text-center my-5 px-5">
          A ver
        </div>
      
        
        
      </div>
	</section>
  
	<section>
	  <div class="container-fluid seccion" id="portfolio">
      Portfolio
    </div>		
	</section>
  
	<section>
	  <div class="container-fluid seccion" id="contact">
      Contact me
    </div>		
	</section>

	<footer>
		<p>Copyright 2018 Martín Comito</p>
	</footer>

</body>

</html>
!

CSS 

              
                body {
  background-color: green;
}

.seccion {
  background-color: grey;
  height: 500px;
  border: 1px solid black;
  margin-bottom: 10px;
  margin-top: 10px;
}

footer {
  text-align: center;
}

.aboutme-div {
  background-color: yellow;
  
}
!

JS 

              
                $(document).ready(() => {
  // set up scrollspy - only needed on codepen because they add the <body> tag for you
  $("body").attr({
    "data-spy": "scroll",
    "data-target": ".navbar",
    "data-offset": "80"
  });

  //Ajusta la posición del scroll cuando estás navegando para guardar links desde otra página
  const scrollAdjust = () => scrollBy(0, -60);
  if (location.hash) scrollAdjust();
  window.addEventListener("hashchange", scrollAdjust);

  // Scroll suave
  $("a.navbar-brand, .navbar-nav li a:not(.dropdown-toggle)").on("click", e => {
    $(".collapse").collapse("hide"); // close mobile menu on click
    $("html, body")
      .stop()
      .animate(
        {
          scrollTop: $($(e.currentTarget).attr("href")).offset().top - 60
        },
        1250,
        "easeInOutExpo"
      );
  });
});
!
999px

Console