Nautilus has a lot of different keyboard shortcuts; you can see some by right clicking on some things (classes, methods, …), and you can see more by clicking on the small v triangle in top-right corner and choosing Shortcuts description. Unfortunately this isn’t a great way to view them or learn them, plus sometimes it is not clear what a shortcut does until you play around with it a bit.
So I’ve compiled a somewhat-organized overview of the shortcuts with some additional tips: