Setting up the ECS in Unity

Hi,
I want to learn how to setup the Entity Component System in Unity. I don't want to use Entitas because I want to do it on my own.

When searching for tutorials I always get these information:

Enitity
A gameobject that holds all the components

Component
Just a datastore with no logic

System
This holds the logic for the components.

But I can't figure out how to setup the project. I would create a `PositionComponent`

Code (CSharp):

1.     public class PositionComponent
2.     {
3.         public int X {get; set;}
4.         public int Y {get; set;}
5.         public int Z {get; set;}
6.     }

and what would I have to do now?

- How do I add this component to the entity?

- How do I manage all the enitities?

- How do I have to setup the system?

I get explanations what the ECS is but I don't get how it works. There is no simple example out there. It would be awesome if there was something like converting this tutorial

https://unity3d.com/de/learn/tutorials/s/roll-ball-tutorial

into a ECS based tutorial.

 

https://forum.unity.com/forums/entity-component-system-and-c-job-system.147/

 

Moved over.

 

https://forum.unity.com/threads/my-kind-of-roll-a-ball-tutorial-pure-ecs.524503/
https://github.com/Unity-Technologies/EntityComponentSystemSamples