CRF Entity Extractor

I’m new to rasa and i want to build a entity extractor for my project ontology based chatbot. Im unable to create an object of CRF entity extractor as a component is needed to be created and passed to entity extractor. But i am unable to understand the difference between component_config and a component in the source code.

Could you provide some more details? E.g. what sort of training data and configuration you’re using