Content for custom category page template

I am implementing some kind of book review website and don‘t know if I am following the correct way.

I am using custom categories for things like genre. I also know that I can have a template for the category („category-genre.php“) to display informations for each genre. But what is the best approach to show also category specific informations like a description about the genre, image, …)? The goal is to be able to click on a category and get some information about the selected category.

A) category-genre-science.php … but is there a possibility to have some kind of meta box for custom categories?
B) A page for each category and a shortcode to integrate the relevant posts as shortcode?
C) ???

Thanks, Sascha