I’m doing a bit of spring cleaning around here, and I wanted to split the list of posts on the index into Week Notes and everything else. I differentiate Week Notes posts from others by tagging them with week-notes and filtering by these seemed easily enough. But I was wrong. In Jekyll, posts exist in a collection called site.posts, which you could pipe into a filter to change the list returned, so you could get a list of Week Notes posts by doing: {% assign posts=site.posts|where_exp: "ite...