Add Category name to Post Title (h1)

How to add Category name to post title (H1)? “PostTitle + CategoryName”?

My h1 post title code:

<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>

I would work the code arround and do something like this.

<h1><?php echo get_the_title(); ?> - <?php the_category(', '); ?></h1>

get_the_title(); Retrieve post title.

the_category(', '); Displays links to categories, each category separated by a comma (if more than one).

Documentation can be founded here : https://codex.wordpress.org/Function_Reference/the_category

Hope it helps you.