Unfortunely, Wordpress doesn't have a default function to display a breadcrumb. We'll see how to create this navigation technique, and display it on our posts, pages and categories archives.
Wordpress, like many other blog engines, uses the rel="nofollow" attribute in comments for the so-called fight against spam. If this was a good idea, it is totally ineffective, and in addition, a link with this attribute will not receive any credit by Google when they rank websites. It is therefore clearly in the interest of bloggers to get rid of rel="nofollow" attribute.