how to create a page that shows all of multiple category posts on a single page

I was seeing nothing in between the header&footer because I did not actually display the posts in my custom query, which can be done using template tags like the_title() and the_content(). More details here: https://developer.wordpress.org/themes/basics/the-loop/ But then I found out that I could simply use the cat parameter in the URL to view posts in … Read more