This will remove a lot fo unnecessary junk from the header

clean-up-wphead

if ( ! function_exists( 'wpforge_head_clean' ) ) :
	function wpforge_head_clean() {
		// Remove the links to the extra feeds such as category feeds
		remove_action( 'wp_head', 'feed_links_extra', 3 );
		// Remove the links to the general feeds: Post and Comment Feed
		remove_action( 'wp_head', 'feed_links', 2 );
		// Remove the link to the Really Simple Discovery service endpoint, EditURI link
		remove_action( 'wp_head', 'rsd_link' );
		// Remove the link to the Windows Live Writer manifest file.
		remove_action( 'wp_head', 'wlwmanifest_link' );
		// Remove index link
		remove_action( 'wp_head', 'index_rel_link' );
		// Remove prev link
		remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 );
		// Remove start link
		remove_action( 'wp_head', 'start_post_rel_link', 10, 0 );
		// Canonical.
		remove_action( 'wp_head', 'rel_canonical', 10, 0 );
		// Shortlink.
		remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
		// Links for adjacent posts.
		remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );		
		// Remove relational links for the posts adjacent to the current post.
		remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 );
		// Emoji detection script.
		remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
		// Emoji styles.
		remove_action( 'wp_print_styles', 'print_emoji_styles' );
		// Remove the XHTML generator that is generated on the wp_head hook, WP version
		remove_action( 'wp_head', 'wp_generator' );
	}
endif;

Just add this to functions.php of your theme and a lot of unnecessary items will be stripped from the header.