Bootstrap 4 breadcrumbs provide the current page's location within a navigation hierarchy that adds separators automatically.
Steps To Create Breadcrumb :
<ol> (ordered list) inside <nav>..breadcrumb to the <ol> element base class.       .breadcrumb-item to <li> element base class.     	active  ,assign .active to <li> element base class also.Note: It is used to locate page position inside navigation hierarchy.
General Syntax
		<nav aria-label="breadcrumb bg-light">
  <ol class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">Home</a></li>
    <li class="breadcrumb-item"><a href="#">Design</a></li>
    <li class="breadcrumb-item active" aria-current="page">Development</li>
  </ol>
</nav>
	  
    Source Code
	
		<nav aria-label="breadcrumb bg-light">
  <ol class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">Web Design</a></li>
    <li class="breadcrumb-item"><a href="#">App Design</a></li>
    <li class="breadcrumb-item active" aria-current="page">Graphics Design</li>
  </ol>
</nav>	
	
    Try it yourself
  Source Code : Output
Note:Here .active is used to indicated current active page inside navigation hierarchy..