Display total number of posts in WordPress by shortcode [ published-posts-count ]

Add to your theme’s functions.php

// Display the total number of published posts using the shortcode [ published-posts-count ]

function customprefix_total_number_published_posts($atts) {
    return wp_count_posts('post')->publish;
}

add_shortcode('published-posts-count',
	      'customprefix_total_number_published_posts');

For pages use [ published-pages-count ]:

// Display the total number of published pages using the shortcode [ published-pages-count ]
function customprefix_total_number_published_pages($atts) {
    return wp_count_posts('page')->publish;
}

add_shortcode('published-pages-count',
	      'customprefix_total_number_published_pages');