custom post on homepage

You can also use a new query (with php enabled) so show a single post by ID, i.e. the post with ID 101:

<?php $my_query = new WP_Query('p=101'); ?>
<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>
<a href="https://wordpress.stackexchange.com/questions/64210/<?php the_permalink() ?>" title="<?php the_title(); ?>">
<?php the_title(); ?><?php the_content(); ?></a>
<?php endwhile; ?>

This can be used multiple times inside the WP loop without conflict.

Use Exec-PHP « WordPress Plugins or others.