How can I add a new content type?

[DannyQuah]

The five different types of content Blog Posts, Portfolio, Publications, Talks, Teaching are excellent. How, though, do I add an additional type? (Stuart Geiger's https://stuartgeiger.com/ for instance also has "Expressions" and "Contact" as, what I assume, are new content types.)

Say I want to add a new type "X". I have experimented with putting in additional stanzas in _config.yml and _data/navigation.yml and pouring content into a new folder _X/. While I can get the path and top-row menu to show appropriately, I can't get the contents of https://DannyQuah.github.io/X/ to display, and thus obviously not either the summary usually rendered. (For now I'm cheating by sneaking it under portfolio/) Any suggestions gratefully accepted.

PS I have studied the Wiki, and have read in the QnA How do I remove and add more pages on the top menu bar #2077. Again, I can add new items in the top menu bar; it is the contents of the folder that I am failing to get to show.

[DannyQuah]

I figured out the answer. I need to set permalink in my entries to activate the new type folder "X/". So in my case, I wanted to put my working papers in their own folder working-papers/. The way to do that is to change appropriately the following:

(_config.yml - add working_papers)
(_data/navigation.yaml - add working_papers)
(_working-papers - populate, use permalink)
(_pages/working-papers.html)

All works now. Thanks for listening.