Dr. Ang Liu is a postdoc researcher at Max Planck Institute for Extraterrestrial Physics (MPE). He got his PhD at Sapienza University of Rome and Italian National Institute for Astrophysics (INAF) in 2019, and worked as a postdoc fellow at INAF from 2019 to 2020. He has been working at MPE since August 2020. The research interests of Dr. Liu mainly involve X-ray observations of galaxy clusters, and the related astrophysics and cosmology.The eROSITA X-ray telescope has performed four X-ray all-sky surveys since its launch in July 2019. In this talk, I will briefly overview eROSITA's early results on galaxy clusters, with an emphasis on the eFEDS PV-phase program. I will also report the latest progress on clusters and superclusters from the first eROSITA All-Sky Survey.