how to show last modified date? Which file to update?

Hi there,

this article provides the PHP you require:

https://docs.generatepress.com/article/generate_post_date_output/#only-show-updated-date

And this article explains how to add the code:

https://docs.generatepress.com/article/adding-php/

Hi,

I have added the code to the functions.php file. Is that ok?

As long as you have installed a Child Theme and it is added to the Child Themes Functions.php.

If you do not have a Child Theme - then use the Code Snippets plugin to add that code.

I don't use a child theme....I usually update this code whenever I update the theme. Is it ok?

If you aren't using a child theme then I would recommend the Code Snippets plugin.

https://docs.generatepress.com/article/adding-php/#code-snippets