Using WordPress ‘post_thumbnail_meta_box()’ PHP function
The `post_thumbnail_meta_box()` function in WordPress allows users to add a post thumbnail meta box to their posts in the WordPress admin panel
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Using WordPress ‘add_site_option()’ PHP function
The `add_site_option()` function in WordPress allows you to add a new option for your website's network
Using WordPress ‘add_rewrite_rule()’ PHP function
Adds a rewrite rule that transforms a URL structure to a set of query vars.
Using WordPress ‘add_permastruct()’ PHP function
The `add_permastruct()` function in WordPress allows users to create custom permalink structures by specifying the name, structure, and parameters for the URL rules