For API documentation check here.
This documentation will cover all the concepts you'll need to use react-ecs.
@react-ecs/core is the primary library in our ecosystem, containing the hooks and components needed to build your ECS.
@react-ecs/core is render agnostic, it comes with stuff for working with the DOM built in. Other libraries provide render specific integrations. Check out @react-ecs/three for working with ThreeJS scenes.
@react-ecs/core has a number of Peer Dependencies you'll need to install too:
But you may already have these.