Posts are not showing up under categories

New to wordpress and am frustrated beyond belief. I simply want to have each of my tabs on my menu show in a post style, like how the homepage is. I understand pages are static so that is not possible. I’m resorting to categories. For instance, my first category is song du jour. So, I did what I’ve read about. I posted my song and checked the song du jour box. When I looked at the live page under song du jour, there’s nothing under there. What am I doing wrong? PLEASE HELP! https://www.chocolatecovereddiamonds.com