Docs: Prerequisite Knowledge section (googleforgames#1821)

* Docs: Prerequisite Knowledge section

Guide for learning the foundational knowledge of Agones, in case our
users have some knowledge gaps they want/need to fill before digging
into Agones itself.

I expect this will be a living doc that will evolve over time.

Closes googleforgames#1759

site/content/en/docs/Overview/_index.md

@@ -52,18 +52,9 @@ Agones incorporates these abilities:
 
 Participation in this project comes under the {{< ghlink href="code-of-conduct.md" branch="master" >}}Contributor Covenant Code of Conduct{{< /ghlink >}}
 
-## This all sounds great, but can you explain Docker and/or Kubernetes to me?
-
-### Docker
-- [Docker's official "Getting Started" guide](https://docs.docker.com/get-started/)
-- [Katacoda's free, interactive Docker course](https://www.katacoda.com/courses/docker)
-
-### Kubernetes
-- [You should totally read this comic, and interactive tutorial](https://cloud.google.com/kubernetes-engine/kubernetes-comic/)
-- [Kubernetes concepts, explained](https://kubernetes.io/docs/concepts/)
-- [Katacoda's free, interactive Kubernetes course](https://www.katacoda.com/courses/kubernetes)
-
 ## What Next?
+- Review our [Prerequisite Knowledge]({{% ref "/docs/Prerequisite Knowledge/_index.md" %}}). Especially if the above
+  sounds fantastic, but you aren't yet familiar with technology like Kubernetes or terms such as "Game Servers".
 - Have a look at our [installation guides]({{< ref "/docs/Installation/_index.md" >}}), for setting up a Kubernetes cluster
   and installing Agones on it.
 - Go through our [Quickstart Guides]({{< ref "/docs/Getting Started/_index.md" >}}) to take you through setting up a simple game server on Agones.

site/content/en/docs/Prerequisite Knowledge/_index.md

@@ -0,0 +1,80 @@
+---
+title: "Prerequisite Knowledge"
+linkTitle: "Prerequisite Knowledge"
+weight: 3
+description: >
+  Foundational knowledge you should know before starting working with Agones.
+---
+
+Agones is built on top of the foundation of multiple open source projects, as well as utilising
+several architectural patterns across both distributed and multiplayer game systems -- which can
+make it complicated to get started with, if they are things you are not familiar with or have
+experience with already.
+
+To make getting started easier to break down and digest, this guide was written to outline what concepts and
+technology that the documentation assumes that you have knowledge of, and the
+depth of that knowledge, as well as providing resource to help fill those knowledge gaps.
+
+## Docker and Containerisation
+
+Docker and containerisation is the technological foundation of Agones, so if you aren't familiar,
+we recommend you have knowledge in the following areas before getting started with Agones:
+
+* Containers as a concept
+* Running Docker containers
+* Building your own container
+* Registries as a concept
+* Pushing and pulling containers from a registry
+
+### Resources
+
+The following resources are great for learning these concepts:
+
+* [Docker Overview](https://docs.docker.com/get-started/overview/)
+* [Docker "Quickstart" guide](https://docs.docker.com/get-started/)
+* [Katacoda's free, interactive Docker course](https://www.katacoda.com/courses/docker)
+
+## Kubernetes
+
+Kubernetes builds on top of Docker to run containers at scale, on lots of machines. 
+If you have yet to learn about Kubernetes, we recommend that you have knowledge in the following
+areas before getting started with Agones:
+
+* Kubernetes as a concept
+* Pods
+* Deployments
+* Services
+* Creating a Deployment with a Service
+
+### Resources
+
+* [You should totally read this comic and interactive tutorial](https://cloud.google.com/kubernetes-engine/kubernetes-comic/)
+* [Kubernetes basics](https://kubernetes.io/docs/tutorials/kubernetes-basics/)
+* [Katacoda's free, interactive Kubernetes course](https://www.katacoda.com/courses/kubernetes)
+* [Kubernetes concepts, explained](https://kubernetes.io/docs/concepts/)
+
+## Dedicated Game Servers
+
+Agones is a platform for dedicated game servers for multiplayer games. If "dedicated game servers" is a term that is not
+something you are familiar with, we recommend checking out some of the resources below, before getting started with
+Agones:
+
+### Resources
+
+* [Dedicated Game Servers, Drawn Badly (video)](https://www.youtube.com/watch?v=Nl_FIGFtYdc)
+* [What Every Programmer Needs To Know About Game Networking](https://gafferongames.com/post/what_every_programmer_needs_to_know_about_game_networking/)
+* [Game Server (wikipedia)](https://en.wikipedia.org/wiki/Game_server)
+* {{< ghlink href="examples/simple-game-server" >}}Example simple gameserver that responds to UDP and/or
+ TCP commands{{< /ghlink >}}
+
+## Game Engine
+
+If you are building a multiplayer game, you will eventually need to understand how your
+[game engine](https://en.wikipedia.org/wiki/Game_engine) will integrate with Agones.
+There are multiple possible solutions, but the engines that have out of the box SDK's for Agones are:
+
+* [Unity](https://unity.com/)
+* [Unreal](https://www.unrealengine.com/)
+
+While you can integrate other engines with Agones, if you are new to developing on a game engine, you may want to
+start with the above.

site/content/en/docs/_index.md

@@ -13,8 +13,11 @@ Release version: {{< release-version >}}
 
 These pages show you how to get up and running as quickly as possible in Agones.
 
-If you are new to Agones, start with [Installation]({{< relref "./Installation/_index.md" >}}), to get Agones
-up and running. 
+If you are new to Agones, start with [Overview]({{< relref "./Overview/_index.md" >}}) to get familiar with Agones'
+features and services.
+
+The [Installation]({{< relref "./Installation/_index.md" >}}) guide will take you through creating a Kubernetes
+cluster and getting Agones installed.
 
 The [Getting Started]({{< relref "./Getting Started/_index.md" >}}) section will have your 
 first `GameServer` up and running, and then have you spinning up `Fleets` after that.