Hi there,
you can use the WP Show Posts plugin:
https://en-gb.wordpress.org/plugins/wp-show-posts/
Once thats installed – create a new WPSP list, were you can set the number of posts you want displayed, columns etc.
It will provide a shortcode that looks like this:
[wp_show_posts id="123"]
Take a note of the id
Then create a new Hook Element, and in that hook text area add this code with the correct id
[wp_show_posts id="123" settings="taxonomy=category&tax_term=current"]
Set the Hook to: generate_after_content
Check the Execute Shortcodes option.
And set the Display Rules Location to Posts > All posts.