source: twentyfourteen/4.3/tag.php

<?php
/**
 * The template for displaying Tag pages
 *
 * Used to display archive-type pages for posts in a tag.
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
 *
 * @package WordPress
 * @subpackage Twenty_Fourteen
 * @since Twenty Fourteen 1.0
 */

get_header(); ?>

        <section id="primary" class="content-area">
                <div id="content" class="site-content" role="main">

                        <?php if ( have_posts() ) : ?>

                        <header class="archive-header">
                                <h1 class="archive-title">
                                <?php
                                /* translators: %s: Tag title. */
                                printf( __( 'Tag Archives: %s', 'twentyfourteen' ), single_tag_title( '', false ) );
                                ?>
                                </h1>

                                <?php
                                        // Show an optional term description.
                                        $term_description = term_description();
                                if ( ! empty( $term_description ) ) :
                                        printf( '<div class="taxonomy-description">%s</div>', $term_description );
                                        endif;
                                ?>
                        </header><!-- .archive-header -->

                                <?php
                                // Start the Loop.
                                while ( have_posts() ) :
                                        the_post();

                                        /*
                                         * Include the post format-specific template for the content. If you want
                                         * to use this in a child theme, then include a file called content-___.php
                                         * (where ___ is the post format) and that will be used instead.
                                         */
                                        get_template_part( 'content', get_post_format() );

                                        endwhile;
                                        // Previous/next page navigation.
                                        twentyfourteen_paging_nav();

                                else :
                                        // If no content, include the "No posts found" template.
                                        get_template_part( 'content', 'none' );

                                endif;
                                ?>
                </div><!-- #content -->
        </section><!-- #primary -->

<?php
get_sidebar( 'content' );
get_sidebar();
get_footer();