I feel like this isn't as hard as I'm imagining, but all I really know about theme code editing is copy-paste.
I'm using the Supply theme, and I've followed the guide on featuring a subset of collections on a page, and it's worked out pretty well. (https://wine-kit-outlet.myshopify.com/pages/vineco) But it's a very boring and uninviting grid of collection images...
What I really wanted was the same layout as the collection pages in list view, like the collection listed as 'red wine' - to display a list of collections with their description as well as the image. I've tried playing with it a little bit but my usual "copy and paste things from similar sections" approach didn't get me very far; could anybody point me to a starting place?