Wordpress Important Code

Some Wordpress Important Code For Functions.php

####...This is code for...show title
add_theme_support('title-tag')
####>>>>This is code for...header
    add_theme_support('custom-header',array(
        'default-image' => get_template_directory_uri().'/style/banner.jpg',

    ));

###>>>>>>>>This Is Code For....Background
    add_theme_support('custom-background');
########################
<?php language_attributes(); ?>
<?php bloginfo('charset'); ?>
<?php echo esc_url(get_template_directory_uri()); ?>/
<?php wp_head(); ?>
<?php wp_footer(); ?>
<?php the_author_posts_link(); ?>
<?php the_category(',') ?>
<?php comments_popup_link('No Comment','One Comment','% Comments','Comment_style','Comment Off'); ?>
<?php the_permalink();?>
<?php the_title();?>
<?php the_post_thumbnail();?>