The aim of this article is to provide references to cognitive scientists, who are interested in learning category theory and using it in their research. This article consists of the three sections, question-and-answers on category theory, utility of category theory on cognitive science, and tutorial materials. In the question-and-answers on category theory, we answered to questions, with which beginners of category theory may come up. In the utility of category theory on cognitive science, we raised the three items of utility of category theory in building cognitive models. The learning materials share the books, slides, and videos on the web, recommended to start with.
