Non featured posts

Hello,

I am having trouble adding filter conditions to my homepage, currently I am using “display latest posts” on my homepage, but would still like to narrow this down by only displaying a specific category. I have been in contact with my theme developer who sent me this as a method.

File : home.php, index.php
Code : if ( have_posts() ) :

Add filter condition to this wordpress method.

Seeing as I am a novice programmer, and the developer was not much help can anyone help me out in understanding this.

Thank You.