Hi,
On the doc rancher2, I do not see or install k3s, I certainly missed the category, could you tell me the installation url of k3s on three knots please?
Thank you in advance
mattmurdock7888
Noobs-Man sur Rancher 
K3s is a separate product from Rancher and has its own site with install instructions here: https://k3s.io/
As far as installing Rancher on a k3s cluster, it’s no different than any other Kubernetes distribution, so you can follow the docs from the Rancher site.