Here is the steps
First print home page
$base_path = esc_url( home_url( '/' ) );
<li class="breadcrumb-item"><a href="<?php print $base_path; ?>">Home</a></li>
then check parent page is available then print parent page
<?php if($post->post_parent){ ?>
<li class="breadcrumb-item"><a href="<?php print get_the_permalink( $post->post_parent ); ?>"><?php print get_the_title( $post->post_parent ); ?></a></li>
<?php } ?>
Print current page
<li class="breadcrumb-item"><a href=""><?php the_title(); ?></a></li>
Final Code
$base_path = esc_url( home_url( '/' ) );
<ol class="breadcrumb">
<li class="breadcrumb-item"><a href="<?php print $base_path; ?>">Home</a></li>
<?php if($post->post_parent){ ?>
<li class="breadcrumb-item"><a href="<?php print get_the_permalink( $post->post_parent ); ?>"><?php print get_the_title( $post->post_parent ); ?></a></li>
<?php } ?>
<li class="breadcrumb-item"><a href=""><?php the_title(); ?></a></li>
</ol>