Nikon Z6 has a Nikon Z lens mount and currently there are 12 native lenses available for this mount.
Z6 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on Z6.
Since Nikon Z6 has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on Z6.
You may also also be interested in these:
Nikon Z6 Lenses with Image Stabilization
Nikon Z6 Lenses with Weather Sealings