Thanks for the rating. I realize some people are unfamiliar with shortcode (in fact, before I created this plugin I had no idea what shortcode was). It turns out shortcode is actually quite flexible and allows for several parameters, so as people asked for more and more features I just added shortcode parameters.
Note also, when I started this plugin it wasn't meant for any of this - there were no categories, no images, nothing at all but a title, some text and a date. As people requested features I only had time to add them rather than document them...so people have left bad ratings for the plugin (thanks for not doing this) because they felt I should have spent all my time documenting things - and, thought I didn't actually have anything else to do but work on this plugin.
In any event, you've made me think I need to do another video explaining better how the shortcode and category works...thank you for that.