You have to specify a filter for a collection, since collections are used to split up the content on your site into specific sections and alter the URL a post lives on.
However, if you’re trying to change the order of posts that appear on your tag routes (eg: Getting Started - Ghost) then it sounds like you might need to make some changes to your theme. What theme are you using? By default, Ghost will return a reverse chronological feed of posts.
Hello Kym, thx for reply.
I understand well the concept of collection and filter and I’ll ask if it was possible to reverse order on all tag/slug pages, because I don’t want to make modification on the theme (for easy upgrade).
I’m with the Casper default theme.
I suppose it was impossible