We have Docker 101 [0] and Kubernetes 101 [1] tutorials on our github repo which may be helpful, assuming you have an understanding of Linux. Or checkout the resources on Docker's website [2].

[0] https://github.com/gravitational/workshop/blob/master/docker...

[1] https://github.com/gravitational/workshop/blob/master/k8s101...

[2] https://www.docker.com/what-docker