The `is_embed()` function in WordPress determines whether the current query is for an embedded post, which can be used in themes or plugins to perform actions specifically for embedded content
The `media_upload_form()` function generates the classic WordPress media upload form, allowing users to select files from their device and upload them to the server
The `locale_stylesheet()` is a WordPress function that allows you to display a localized stylesheet link element by using the `wp_enqueue_script` action hook