# Kubernetes Documentation: releases.k8s.io/HEAD
*** PLEASE NOTE: This documentation 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](http://releases.k8s.io).
## Where to start
* The [User's guide](user-guide.md) is for anyone who wants to run programs and
services on an existing Kubernetes cluster.
* The [Cluster Admin's guide](cluster-admin-guide.md) is for anyone setting up
a Kubernetes cluster or administering it.
* The [Developer guide](developer-guide.md) 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](kubectl.md) is a detailed reference on
the `kubectl` CLI.
* The [API object documentation](http://kubernetes.io/third_party/swagger-ui/)
is a detailed description of all fields found in core API objects.
* An overview of the [Design of Kubernetes](design/)
* There are example files and walkthroughs in the [examples](../examples/)
folder.
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