From the previous, I was feeling unnatural categories and tags of Q2A. Previously, gurjyot showed Discourse to me. But I did not understand its meaning at the time. However, now I can understand it. And, Amiya made a blog plugin for Q2A. However, I seemed his approach is inappropriate for community tool. I think development approach of Flarum is better. It is category and tag.
I want to consider taking in the architecture of Flarum to PowerQA.