I bought a Nikon Z6 camera. Can I use it to connect Canon's F-mount lens? What kind of adapter ring do you use?

First of all, to correct you, Canon doesn't have an F-mount lens. EF lens for Canon SLR camera and FD bayonet lens by hand in MF era. Canon micro camera uses RF lens.

Nikon's Z6 micro camera can use its own Z-port lens and its own FTZ adapter ring to transfer all Nikon's F-port lenses. Of course, neither the early manual lens nor the AF-D lens can realize the AF function.

Because Nikon's Z-series micro camera has the shortest flange distance, it can shoot almost any bayonet lens through a third-party rotation, and of course it can perfectly support Canon's EF series SLR lens.

Caleb EF-NZ adapter ring

Although theoretically Nikon Z series micro-cameras can use any mainstream common bayonet lens, the flange distance of Canon micro-cameras is also very short, second only to Nikon, and their flange distance is 4mm, so it is actually impossible to make such a thin adapter ring. Moreover, the tail of the RF lens is specially designed, about 5mm deep into the bayonet, and the diameter of the bayonet is only smaller than Nikon Z port 1mm, which is actually not feasible.