k3s installs itself with "Local Path Provisioner", a simple controller whose job it is to create local volumes on each k3s node. If you only have one node, or you just want something simple to start learning with, then local-path is ideal, since it requires no further setup.
This is a companion discussion topic for the original entry at https://geek-cookbook.funkypenguin.co.nz/kubernetes/persistence/local-path-provisioner/