WordPress is great in many ways and comes with a lot of built-in features.
Some administrators (me included) choose to remove some standard functions to improve speed and/or security.
I usually remove the following features by default.
remove_action('wp_head','wp_generator'); remove_action('wp_head','wlwmanifest_link'); remove_action('wp_head','rsd_link'); remove_action('wp_head', 'start_post_rel_link', 10, 0 ); remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0); remove_action('wp_head', 'rel_canonical');