// write this in functions.php

remove_action( 'wp_head', 'rsd_link' );
remove_action( 'wp_head', 'wlwmanifest_link' );
remove_action( 'wp_head', 'wp_generator' );
remove_action( 'wp_head', 'start_post_rel_link' );
remove_action( 'wp_head', 'index_rel_link' );
remove_action( 'wp_head', 'adjacent_posts_rel_link' );
remove_action( 'wp_head', 'wp_shortlink_wp_head' );
remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head' );
remove_action( 'wp_head', 'feed_links_extra' );
remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
remove_action( 'wp_print_styles', 'print_emoji_styles' );
remove_action( 'admin_print_styles', 'print_emoji_styles' );
remove_action('wp_head','wp_oembed_add_discovery_links', 10 );
remove_action('wp_head','wp_oembed_add_host_js');
remove_action ('wp_head', 'rel_canonical');
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );

show_admin_bar(false);