Where’s your content inside the loop? You need at least <?php the_content(); ?> to display the post. You might even want to have <?php the_title(); ?> before that.
hi yeah, but that doesnt do anything. I have added both content/title now but when i click a post thumbnail i only get a white screen. And if i inspect i see nothing. And still the Failed to load resource: the server responded with a status of 404 (Not Found) in the console.