Código da página
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-light mb-4" style="background-color:aqua">
<div class="container">
<div class="navbar-brand mb-0 h1">
<h3>BootStrap - Abas de navegação - NavTabs</h3>
</div>
</div>
</nav>
<div style="padding-left:5px" class="container mt-3">
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link active" href="#">Ativa</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link2</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Inativa</a>
</li>
</ul>
</div>
<br /><hr /><br />
<nav class="navbar navbar-light mb-4" style="background-color:aqua">
<div class="container">
<div class="navbar-brand mb-0 h1">
<h3>BootStrap - Abas de navegação - Estilo pilula (pills)</h3>
</div>
</div>
</nav>
<div style="padding-left:5px" class="container mt-3">
<ul class="nav nav-pills">
<li class="nav-item">
<a class="nav-link active" href="#">Ativa</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link3</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link4</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Inativa</a>
</li>
</ul>
</div>
<br /><hr /><br />
<nav class="navbar navbar-light mb-4" style="background-color:aqua">
<div class="container">
<div class="navbar-brand mb-0 h1">
<h3>BootStrap - Abas de navegação - Estilo pilula (pills) - mesmo tamanho</h3>
</div>
</div>
</nav>
<div style="padding-left:5px" class="container mt-3">
<p>para fazer os itens terem a mesma largura use a classe .nav-justified class:</p>
<p>tabs no estilo pilula(pills):</p>
<ul class="nav nav-pills nav-justified">
<li class="nav-item">
<a class="nav-link active" href="#">Ativa</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link5</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link6</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Inativa</a>
</li>
</ul><br>
<p>tabs no estilo comum:</p>
<ul class="nav nav-tabs nav-justified">
<li class="nav-item">
<a class="nav-link active" href="#">Ativa</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link7</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link8</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Inativa</a>
</li>
</ul>
</div>
<br /><hr /><br />
<nav class="navbar navbar-light mb-4" style="background-color:aqua">
<div class="container">
<div class="navbar-brand mb-0 h1">
<h3>BootStrap - Abas de navegação - Selecionáveis ( Toggleable Tabs )</h3>
</div>
</div>
</nav>
<div style="padding-left:5px" class="container mt-3">
Conforme clicamos na aba o conteúdo da janela é modificado.<br /><br />
<div class="container mt-3">
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link active" data-toggle="tab" href="#home">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" data-toggle="tab" href="#menu1">Menu 1</a>
</li>
<li class="nav-item">
<a class="nav-link" data-toggle="tab" href="#menu2">Menu 2</a>
</li>
</ul>
<!-- Tab panes -->
<div class="tab-content">
<div id="home" class="container tab-pane active">
<br>
<h3>HOME</h3>
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</div>
<div id="menu1" class="container tab-pane fade">
<br>
<h3>Menu 1</h3>
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</div>
<div id="menu2" class="container tab-pane fade">
<br>
<h3>Menu 2</h3>
<p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.</p>
</div>
</div>
</div>
</div>
</body>
</html>