Explore galaxy cluster studies using the largest cosmological surveys in this informative lecture by Joseph Mohr. Delve into the cutting-edge research and methodologies employed in analyzing vast datasets from wide-area surveys such as SDSS, DES, KiDS, and HSC. Learn about the future of cosmological observations with upcoming projects like DESI, PFS, Euclid, and LSST. Gain insights into how these surveys contribute to our understanding of large-scale structures in the Universe and their implications for precision cosmology. Discover the intersection of big data science and cosmology, and understand the importance of multi-messenger approaches in advancing our knowledge of the cosmos.