Show post titles at category, and show your own words at homepage.

<?php get_header(); ?>

<?php if (is_home())

echo ”
Welcome, add your own words here!

“; ?>

<?php if (!is_home())

{ ?>
<ul>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<li>
<a href=”<?php echo get_permalink()?>”><?php the_title(); ?></a>
</li>
<?php endwhile; endif; ?>
<ul>

<?php }  ?>

<?php get_footer(); ?>