These two manga are completely different, one being a comedy shoujo, the other one being a violent mystery horror. Then why the suggestion? Simple.
0 kara Hajimeru Manga Kyoushitsu explains in every chapter different materials and techniques for people interested in becoming a mangaka.
Fraction has important chapters where the author shares not only stories and opinions, but he gives important tips on how to write mystery novels/manga and explains how important an accurate use of the perspective in panels is.