Lead Developer
Hard for me to know what’s going on really.
Have you tried this plugin?: https://wordpress.org/plugins/display-posts-shortcode/
It’s very well written and should do something similar to what you’re looking for.
Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development