How to add comments in Wordpress?

Question

CMS

There is a site. I need to add a block with comments to the main (index) page there, how can I do this? So that when you go to the site, there are immediately comments at the bottom. On single.php it works, but not on index.php. What is the problem?
I add this code
<?php comments_template(); ?>

Answer 1

And if so ?