Using Categories and Tags

I think I’m getting this. Categories are a limited set of categories that the administrators use to help organize things. Tags are more free-form enabling users to tag ideas etc. So I just created a new tag ‘using-tags’. But I could also use to refine the categories.
e.g for a post on Buy Clean policy I could put under policy category and tag Buy Clean…???
Then users could sort for both. Correct @clf-admin?

Yes, I think that’s correct!. As administrators, we also have the ability to create a whole lot of tags and place those tags into some sort of hierarchy we design – just to kick things off.

PS, this is a reply from me using the web interface.

Yes, I think that’s correct!

PS this is a reply from me to an email I got from you through the network system.when you added my tag @clf-admin