The lecture was held as part of the CRAFT-OA coffee lecture series 10th Febraury 2025. It introduces the OpenAIRE Guidelines and the OpenAIRE Graph: As an essential compliance requirement for data sources - institutional repositories, CRIS, Open Access journals, and aggregators - on structuring their metadata records to comply with the OpenAIRE Guidelines and ensure their metadata is harvested and integrated into the OpenAIRE Graph. The OpenAIRE Graph stands as one of the world's largest knowledge graphs and serves as an authoritative source for the European Open Science Cloud (EOSC).