comments not saved DB

hi
I am trying to create new theme from scratch (learning) , using some videos on the internet
https://blog.epicerastudio.com/2010/06/the-top-five-places-to-learn-wordpress/
I am on day 8 . there are two things , comments are not saved in the DB and when I click submit it takes me to posts’ page .
please help

<?php if($comments) :?>
<ol id='comment_section'>
	<?php foreach($comments as $comment):?>
	<li id="comment-<?php comment_ID();?>">
		<?php if($comment->comment_approved='0') :?>
			<p>Your comment is undergoing moderation.</p>
		<?php endif;?>
		<?php comment_text();?>
		<p><?php comment_author_link();?> on <?php comment_date();?></p>
	</li>
	<?php endforeach;?>
</ol>
<?php else:?>
<p>Be the first to comment!</p>
<?php endif;?>
<?php if(comments_open()):?>
	<?php if(get_option('comment_registration') && !$user_ID) :?>
		<p>You must be logged in to commit on this article.</p>
	<?php else:?>
	<form action="<?php echo get_option('siteurl');?>"/wp-comments-post.php" method="post" id="commentform">
		<?php if($user_ID):?>
		<p>Logged is as <a href="<?php echo get_option('siteurl');?>/wp-admin/profile.php"><?php echo $user_identity;?></a></p>
		<?php else: ?>
			<p><input type='text' name='author' id='author' value="<?php echo $comment_author;?>"/>
				<label for='author'>Name</label></p>
			<p><input type='text' name='email' id='email' value="<?php echo $comment_author_email;?>"/>
				<label for='email'>Mail <?php if($req) echo '(Required field)';?></label> </p>
			<p><input type='text' name='url' id='url' value="<?php echo $comment_author_url;?>"/>
				<label for='url'>Website </label></p>
		<p>
		<?php endif;?>
		<textarea name='comment' id='comment' cols='50' rows='10'></textarea>
		</p>
		<p><input type='submit' name='submit' id='submit' value='Submit'/></p>
		<input type='hidden' name='comment_post_ID' value="<?php echo $id;?>"/>
		<?php do_action('comment_form',$post->ID);?>
		</form>
	<?php endif;?>
<?php else:?>
		<p>Comments are currently closed</p>
<?php endif; ?>