*** PLEASE NOTE: This document applies to the HEAD of the source tree only. If you are using a released version of Kubernetes, you almost certainly want the docs that go with that version.

Documentation for specific releases can be found at releases.k8s.io.

Kubernetes Documentation: releases.k8s.io/HEAD

The User's guide is for anyone who wants to run programs and services on an existing Kubernetes cluster.
The Cluster Admin's guide is for anyone setting up a Kubernetes cluster or administering it.
The Developer guide is for anyone wanting to write programs that access the kubernetes API, write plugins or extensions, or modify the core code of kubernetes.
The Kubectl Command Line Interface is a detailed reference on the kubectl CLI.
The API object documentation is a detailed description of all fields found in core API objects.
An overview of the Design of Kubernetes
There are example files and walkthroughs in the examples folder.