How to show a category page instead of my homepage?

Hi,

I want to show this category page:
https://www.christiandube.ca/category/a-la-une/

Instead of my Homepage: https://www.christiandube.ca

I know it’s possible by including this:
if( is_home() ) query_posts( ‘cat=1’ );

on my home.php but my question is: where do I have to put that? Before what and after what?

Thanks!