Using WordPress ‘add_rewrite_tag()’ PHP function
The article provides information on how to use the WordPress `add_rewrite_tag()` function to add a custom data in the URL of your website by calling it within an 'init' hook
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Using WordPress ‘comment_form()’ PHP function
Outputs a complete commenting form for use within a template.
Using WordPress ‘adjacent_posts_rel_link()’ PHP function
Displays the relational links for the posts adjacent to the current post.
Using WordPress ‘date_i18n()’ PHP function
Retrieves the date in localized format, based on a sum of Unix timestamp and timezone offset in seconds.