Bootstrap 4 nav provides a simple and easy way to create horizontal and vertical nav components like tabs and pills. It has other different properties and features that make the navs component more elegant.
id="id-of-collapse-element" and .collapse to the collapsible element ..nav to the <ul> element base class.
   .nav-item to the <li> element base class..nav-link to the <a> element base class.General Syntax
		<ul class="nav">
  <li class="nav-item">
    <a class="nav-link" href="#">Nav Item</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container mt-4">
  <ul class="nav">
    <li class="nav-item">
      <a class="nav-link" href="#">Web Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Web Development</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Graphics Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Testing</a>
    </li>
  </ul>
</div>	
	
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  Source Code : Output
Note: 
In the above example,.nav is assigned to the  <ul> ,.nav-item to the <li> & .nav-link to the <a> element base class.
.justify-content-center to the <nav> container.
  .justify-content-end to the <nav> container..flex-column to the <nav> container.
General Syntax
		<nav class="nav justify-content-center"></nav>
<nav class="nav justify-content-end"></nav>
<nav class="nav flex-column"></nav>
	  
    Source Code
	
		<div class="container my-2">
  <nav class="nav justify-content-center">
    <a href="#" class="nav-item nav-link active">Learn HTML</a>
    <a href="#" class="nav-item nav-link">Learn CSS</a>
    <a href="#" class="nav-item nav-link">Learn Bootstrap</a>
    <a href="#" class="nav-item nav-link disabled">Seo</a>
  </nav>
</div>	
	
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  Source Code : Output
Note: 
In the above example,flexbox utility classes are used to align nav component in the left, center and right direction.Please keep in mind that nav component is aligned by default in the left direction.To align center use .justify-content-center & to align right use .justify-content-end.
.nav and .nav-tabs to the <ul> element base class. 
.nav-item to the <li> element base class. 
   .nav-link to the <a> element base class.
		
	General Syntax
		<ul class="nav nav-tabs">
  <li class="nav-item">
    <a class="nav-link active" href="#">Tab Item</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container my-2">
  <ul class="nav nav-tabs">
    <li class="nav-item">
      <a class="nav-link active" href="#">App Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">App Development</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Software</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Testing</a>
    </li>
  </ul>
</div>	
	
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  Note: 
In the above example,bootstrap tabs can be created by assigning .nav ,.nav-tabs to the <ul> element base class ,.nav-item to the <li> element base class and .nav-link to the <a> element base class.
.active to the <a> element base class. .disabled to the <a> element base class General Syntax
		<ul class="nav nav-tabs">
  <li class="nav-item">
    <a class="nav-link active" href="#">Tab Item1</a>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Tab Item2</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container mt-4">
  <ul class="nav nav-tabs">
    <li class="nav-item">
      <a class="nav-link active" href="#">Web Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Graphics Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">App Design</a>
    </li>
  </ul>
</div>	
	
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To make tab item active,assign .active to the  <a> element base class while to make disabled tab item,assign .disabled to the <a> element base class.
.nav and
   .nav-pills to the  <ul> element base class. 
.nav-item to the <li> element base class. 
.nav-link to the 
    <a> element base class.
General Syntax
		<ul class="nav nav-pills">
  <li class="nav-item">
    <a class="nav-link active" href="#">Pills Item</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container mt-4">
  <ul class="nav nav-pills">
    <li class="nav-item">
      <a class="nav-link active" href="#">Web design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Web Development</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Graphics Design</a>
    </li>
  </ul>
</div>
<!--/container-->	
	
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  Note: 
In the above example ,.nav,.nav-pills,.nav-item & .nav-link are used to make bootstrap pill menu.
.active to the <a> element base class. .disabled to the <a> element base class General Syntax
		<ul class="nav nav-pills">
  <li class="nav-item">
    <a class="nav-link active" href="#">Active Link1</a>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled Link2</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container mt-4">
  <ul class="nav nav-pills">
    <li class="nav-item">
      <a class="nav-link active" href="#">Active 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="#">Disabled Link3</a>
    </li>
  </ul>
</div>	
	
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  .nav, .nav-pills & .flex-column to the <ul> element base class. 
.nav-item to the <li> element base class. 
.nav-link to the <a> element base class.
General Syntax
		<nav class="nav nav-pills flex-column"></nav>
	  
    Source Code
	
		<div class="container mt-4">
  <nav class="nav nav-pills flex-column">
    <a href="#" class="nav-item nav-link active"> <i class="fa fa-laptop" aria-hidden="true"></i> Design </a>
    <a href="#" class="nav-item nav-link"> <i class="fa fa-creative-commons" aria-hidden="true"></i> Creative </a>
    <a href="#" class="nav-item nav-link"> <i class="fa fa-mobile" aria-hidden="true"></i> App </a>
  </nav>
</div>	
	
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  Note: 
To create vertical pill menu,assign .flex-column to the pills container(<nav>) base class.
	To extend navigation nav into whole available width,use .nav-fill to the <ul> having class either
	.nav .nav-pills or .nav .nav-tabs.Please keep in mind that every nav item will not be same width.
General Syntax
		<ul class="nav nav-pills nav-fill"></ul>
	  
    Source Code
	
		<div class="container my-2">
  <ul class="nav nav-pills nav-fill">
    <li class="nav-item">
      <a class="nav-link active" href="#">Design</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Development</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Seo</a>
    </li>
  </ul>
</div>	
	
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  Note: 
Navbar component can be extended within full available width,by assigning .nav-fill to the <ul> container base class.
  To align equal width of nav/pill menu item, use .nav-justified to the <ul> having class either
	.nav .nav-pills or .nav .nav-tabs
General Syntax
		<ul class="nav nav-pills nav-justified"></ul>
	  
    Source Code
	
		<ul class="nav nav-pills nav-justified">
  <li class="nav-item">
    <a class="nav-link active" href="#">Active Link1</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link2</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link3</a>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled Link 4</a>
  </li>
</ul>	
	
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  Note: 
Equal width inside nav/pill menu item can be created very easily by just using .nav-justified.These class must be assigned to the nav container or pill container base class.
.nav & .nav-tabs  to  the <nav> element base class. 
.nav-item  &  .nav-link to the <a> element base class. 
General Syntax
		<nav class="nav nav-tabs">
  <a href="#" class="nav-item nav-link active">Link 1</a>
  <a href="#" class="nav-item nav-link">Link 2</a>
  <a href="#" class="nav-item nav-link">Link 3</a>
</nav>
	  
    Source Code
	
		<div class="container- my-3">
  <nav class="nav nav-tabs">
    <a href="#" class="nav-item nav-link active">Link 1</a>
    <a href="#" class="nav-item nav-link">Link 2</a>
    <a href="#" class="nav-item nav-link">Link 3</a>
  </nav>
</div>	
	
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  Note: 
To create nav based navigation,assign .nav & .nav-tabs to the <nav> element base class &  assign .nav-link and .nav-item to the <a> element base class.
.nav & .nav-pills to the <nav>  element base class. 
.nav-item  &  .nav-link to the <a> element base class. 
General Syntax
		<nav class="nav nav-pills">
  <a href="#" class="nav-item nav-link active">Web Design</a>
  <a href="#" class="nav-item nav-link">Graphics Design</a>
  <a href="#" class="nav-item nav-link">App Development</a>
</nav>
	  
    Source Code
	
		<div class="container- my-3">
  <nav class="nav nav-pills">
    <a href="#" class="nav-item nav-link active">Home</a>
    <a href="#" class="nav-item nav-link">About</a>
    <a href="#" class="nav-item nav-link">Contact</a>
  </nav>
</div>	
	
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  Note: 
To create pill based navigation,assign .nav & .nav-pills to the <nav> element base class &  assign  .nav-link and .nav-item to the <a> element base class.
Boostrap Tabs With Dropdown can be made by utilizing tabs/pills and dropdown concept.
General Syntax
		<ul class="nav nav-tabs">
  <li class="nav-item">
    <a class="nav-link active" href="#">Link1</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#">Link 1</a>
      <a class="dropdown-item" href="#">Link 2</a>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Link3</a>
  </li>
</ul>
	  
    Source Code
	
		<div class="container my-3">
  <ul class="nav nav-tabs">
    <li class="nav-item">
      <a class="nav-link active" href="#">Link1</a>
    </li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item" href="#">Link 2</a>
      </div>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Link3</a>
    </li>
  </ul>
</div>	
	
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  Note: Bootstrap tab with dropdown can be created very easily by using tabs and dropdown concept.
Follow pill and dropdown concept to make boostrap tab with dropdown menu.
General Syntax
		<ul class="nav nav-pills">
  <li class="nav-item">
    <a class="nav-link" href="#">Home</a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Services</a>
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#">Service 1</a>
      <a class="dropdown-item" href="#">Service 2</a>
      <a class="dropdown-item" href="#">Service 3</a>
    </div>
  </li>  
  <li class="nav-item">
    <a class="nav-link active" href="#">Event</a>
  </li>
 
</ul>
	  
    Source Code
	
		<div class="container my-3">
  <ul class="nav nav-pills">
    <li class="nav-item">
      <a class="nav-link" href="#">Home</a>
    </li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Services</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Service 1</a>
        <a class="dropdown-item" href="#">Service 2</a>
        <a class="dropdown-item" href="#">Service 3</a>
      </div>
    </li>
    <li class="nav-item">
      <a class="nav-link active" href="#">Event</a>
    </li>
  </ul>
</div>
<!--/source_code_result--display-->	
	
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  Note: Bootstrap pill with dropdown can be created very easiy by using pill and dropdown concept.