Where is the Unreal's damage system documentation?

Hi!
I’ve seen that when you spawn an actor you can set an instigator, which is described as the origin for damage done by the spawned actor, which makes me believe unreal has a builtin system for damage, the problem is I can’t find documentation for the system, I found the page for damage, but not how you should use it, how you get the health of an actor, etc. Is there a documentation for the damage system?

there is a damage system, but no health system.

you can think of the damage system as a way to communicate between actors that is multiplayer supported.

What the actors actually do from the events and data about damage and damage types is up to you.

Heres a detailed practical example article:
Multiplayer Damage and Health System in Unreal Engine 4 - Couch Learn