Ask HN: What hotkeys or keyboard shortcuts help navigate HN?

I would love to be able to use news reader type hotkeys for threads for easy navigation of articles/threads. E.g., skip thread/mark as read/etc... Personally, I am thinking back to the days of Xnews (https://en.wikipedia.org/wiki/Xnews). Am I alone in wishing for such support? Does it already exist somewhere? Robert