Custom Page Template to run php code.

Hi folks,

i just followed a tutorial in creating a custom page template. But he did not tell where to put our own php codes. Because i need to put a student registration form guys.

<?php /* Template Name: CustomPageT1 */ ?>

<?php get_header(); ?>

	<div id="primary" <?php wen_associate_content_class( 'content-area' ); ?> >
		<main id="main" class="site-main" role="main">

			<?php while ( have_posts() ) : the_post(); ?>

				<?php get_template_part( 'template-parts/content', 'page' ); ?>

				<?php
					// If comments are open or we have at least one comment, load up the comment template
					if ( comments_open() || get_comments_number() ) :
						comments_template();
					endif;
				?>

			<?php endwhile; // end of the loop. ?>

		</main><!-- #main -->
	</div><!-- #primary -->

<?php
/**
 * wen_associate_action_sidebar hook
 *
 * @hooked: wen_associate_add_sidebar - 10
 *
 */
do_action( 'wen_associate_action_sidebar' );?>

<?php get_footer(); ?>