Finding the .php file in parent template

Hello guyz, I am new to wordpress and I am trying to learn about custom theming. I made a child theme of a certain template (Farben Basic) and I wanna hide the “NOTHING HAS FOUND”. I can locate it using the development tool of chrome the tags/divs but I COULDNT FIND/LOCATE which .PHP file in parent theme I COULD FIND IT OR which .PHP file in parent theme I will edit. Basically this is one of my problem. How would I know that this certain part of a page can be found in this certain .php file in the parent theme. Coz I wanna copy that one to child folder and do the edit/deletion of tags. Thanks