How would I change the page template for a categories page?

I’m new to wordpress and this is the first design I’ve made for wordpress (https://scoobydooobyd00.com/).

My site has all my tutorials, and sources to my tutorials. You’ll notice that under that Navigation there’s a link to the Videos page (which is a category) but I want it to have its own page style like this page (https://scoobydooobyd00.com/videos) – this page is an actual page

At first I Tried to make the videos page (not the category) load all the post under the category “videos”, but after searching the forums I realized I needed to use a category but when I do that I can’t specify the page template I want.

Also I don’t want my tutorials/videos to show up on the home page so I used this script to exclude the posts from the home page

function exclude_category($query) {
	if ( $query->is_home ) {
		$query->set('cat', '-19');
	}
return $query;
}

add_filter(‘pre_get_posts’, ‘exclude_category’);
Thanks in advance, ScoobyDooobyD00