When I was writing a blog recently, I learned about the concepts of category and tag. As I have been reviewing the knowledge of OOP recently, I found that category is the relation of is-a and tag is the relation of has-a.
Now my question is that I am writing an article on C++ concurrency, and now that I have the category in the C++ learning manual, I am wondering whether to create a new category for concurrent programming, where there are two categories, or a new tag, where there is only one category