Custom content.php

Hello,I just edit my content.php to add some div,i remove default code in content.php and add new code,i just wonder is it ok ? pls check it
Here is default code in content.php

<div class="inside-article">
		<?php
		/**
		 * generate_before_content hook.
		 *
		 * @since 0.1
		 *
		 * @hooked generate_featured_page_header_inside_single - 10
		 */
		do_action( 'generate_before_content' );
		?>

		<header class="entry-header">
			<?php
			/**
			 * generate_before_entry_title hook.
			 *
			 * @since 0.1
			 */
			do_action( 'generate_before_entry_title' );

			the_title( sprintf( '<h2 class="entry-title" itemprop="headline"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' );

			/**
			 * generate_after_entry_title hook.
			 *
			 * @since 0.1
			 *
			 * @hooked generate_post_meta - 10
			 */
			do_action( 'generate_after_entry_title' );
			?>
		</header><!-- .entry-header -->

I changed these code to

<div class="inside-article">
	<div class="post-image">		
<?php if ( has_post_thumbnail() ) : ?>
    <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
        <?php the_post_thumbnail(); ?>
    </a>
<?php endif; ?>
	<h2 class="entry-title"><a href="<?php the_permalink(); ?>"><?php the_title (); ?></a></h2>
	</div>

My question is :
1.Is it ok with my site ?,i wonder if my new code affect seo or something like that.
2.Should i remove hooks connected with old code ? eg: ' generate_before_content hook.' if yes pls tell me how.
Tks much!