They have a separate article for custom taxonomy: hidden link
I did read it but I am not knowledgeable enough in PHP to make use of that info.
So to make sure I got it right if going with taxonomy for the "free" filter.
Should I make "Free" a new taxonomy for Courses and duplicate all categories in it and set up its permalink using the pro plugin? Is there any way to have "Free" as a custom taxonomy but not have to duplicate and maintain duplicates of the categories?
Should I make "Free" a new taxonomy for Courses and duplicate all categories in it?
I believe you can do that. I just run a small test, and I was able to register the same term(actually the same slug) in two different taxonomies.
This gives me the idea, of actually, creating a sub-category(Free) for each course category. Then, the post that is free should have both terms assigned to it, the category and its free sub-category) 🙂
I find it a really nice workaround. Sorry for not thinking about it.
Is there any way to have "Free" as a custom taxonomy but not have to duplicate and maintain duplicates of the categories?
Theoretically, yes. Using rewrite rules. Personally, I could not figure it out.
