Is better to start with the command to drain / uncordon the node before even running apt update and install for kubadm? Instead of following the exact sequence of the docs
It doesn’t really matter; nothing you’re doing will likely affect the cluster until you run kubeadm upgrade. As long as you drain the node before you actually do that, the order doesn’t really matter.
For minor version doc does not imply drain. But I guess for exam it is safter to use drain regardless as downtime is not an issue. I usually do undorcon and drain both for practice