How do I customize the post page

Question

I'm currently trying to add an post page on my Wordpress website. I put my new post page as the default post page, on Settings -> Reading.

The id of my page is 353. So I created a new php file named page-353.php based on page.php. But the current template is still index.php.

Is there a way I can customize the HTML/PHP of the default post page? Thank you.

Answer 1

I'm answering my own question, since I found the solution: this page have a default name, since it's a key page for Wordpress. Considering this chart its name is home.php.