The post slug is the part of the URL of a post or page at the last section. E.g.:
Page: https://wplancer.com/about/
Post: https://wplancer.com/2015/09/post-slug-here/
There are two ways to get the slug in WordPress inside the loop. The first way is to access the $post object that is available inside the loop.
$slug = $post->post_name;The second way is to pass the whole permalink to the basename function, which will automatically process the URL and give us only the slug.
$slug = basename(get_permalink());Use the way that makes most sense to you to get the post slug in WordPress. Keep building!