Systems are the main use of the engine. You can change entities and their components within these. If you would like to learn how to create a new system, look here. Throughout this doc I would like to talk about how to add, remove, and utilize systems you have created.

Both of these add and remove systems that have been registered to the ECSManager.

//Adding a system you have created.
ECSManager.AddSystem<SystemType>();

//Removing a system you have created. Not really ever needed.
ECSManager.RemoveSystem<SystemType>();

Systems are used to alter entities and their components. You can take a look at the API for usage information. ECSManager. System Attributes. Also Check out the tutorials for more information on actually applying these principles. Tutorials.